oOoOoOo Halo 3(Only XBox 360) oOoOoOoُ

Get Alternate Ending:
Complete the final mission under the Legendary difficulty setting.

Get Katana:
Unlock all achievements and collect all skulls.

Achievements:
Complete the following achievements to unlock Xbox Live Gamerscore points.

Landfall (20 points): Finish the first mission of the Campaign on Normal, Heroic, or Legendary.

Holdout (20 points): Finish the second mission of the Campaign on Normal, Heroic, or Legendary.

The Road (20 points): Finish the third mission of the Campaign on Normal, Heroic, or Legendary.

Assault (30 points): Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.

Cleansing (30 points): Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.

Refuge (30 points): Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.

Last Stand (40 points): Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.

The Key (40 points): Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.

Return (50 points): Finish the final mission of the Campaign on Normal, Heroic, or Legendary.

Campaign Complete: Normal (125 points): Finish the Campaign on Normal.

Campaign Complete: Heroic (125 points): Finish the Campaign on Heroic (unlocks achievement for Normal, if not earned).


Campaign Complete: Legendary (125 points): Finish the Campaign on
Legendary (unlocks achievements for Normal and Heroic, if not earned).

Iron (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Black Eye (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Tough Luck (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Catch (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Fog (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Famine (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Thunderstorm (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Tilt (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Mythic (10 points): Finish the Campaign on Normal, Heroic, or Legendary, then find and claim this skull.

Spartan Program Recruit (10 points): Win your first game in matchmaking to sign up for the Spartan Program (Online).

UNSC Spartan (15 points): Earn your Sergeant rating to be recognized as a true Spartan (Online).

Spartan Officer (25 points): Advance to the Spartan Officer ranks (Online).

Two for One (5 points): Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).


Too Close to the Sun (5 points): Destroy an enemy banshee with the
spartan laser or missile pod in a ranked playlist or in campaign.

Triple Kill (5 points): Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

Overkill (5 points): Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

Lee R Wilson Memorial (5 points): Score 5 grenade sticks in any ranked free for all playlist (Online).

We're in for some Chop (5 points): Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.

Killing Frenzy (5 points): Kill 10 enemies without dying in any ranked free for all playlist (Online).

Steppin' Razor (5 points): Score a Triple Kill with the sword in a ranked free for all playlist (Online).

Mongoose Mowdown (5 points): Splatter an enemy with the mongoose in a ranked free for all playlist (Online).

Up Close and Personal (5 points): Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).

Fear the Pink Mist (5 points): Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.

Headshot Honcho (5 points): Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.

Used Car Salesman (5 points): Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.

Marathon Man (40 points): Locate and access all Terminals in the Campaign.

MVP (5 points): Earn the MVP in any ranked playlist (Online).


Maybe Next Time Buddy (5 points): Board the same vehicle within 10
seconds after being boarded in any free for all playlist (Online).

Demon (10 points): Score over points in the Campaign meta-game on the second mission.

Guerilla (10 points): Score over points in the Campaign meta-game on the first mission.

Cavalier (10 points): Score over points in the Campaign meta-game on the third mission.

Askar (10 points): Score over points in the Campaign meta-game on the fourth mission.

Exterminator (10 points): Score over points in the Campaign meta-game on the fifth mission.

Ranger (10 points): Score over points in the Campaign meta-game on the sixth mission.

Vanguard (10 points): Score over points in the Campaign meta-game on the seventh mission.

Orpheus (10 points): Score over points in the Campaign meta-game on eighth mission.

Reclaimer (10 points): Score over points in the Campaign meta-game on the final mission.

Armor parts:
Complete the indicated task in Campaign mode to unlock the corresponding armor part in Multi-player mode.

Elite Ascetic Body: Earn the "Up Close and Personal" achievement.
Elite Ascetic Head: Earn the "Steppin' Razor" achievement.
Elite Ascetic Shoulders: Earn the "Overkill" achievement.
Elite Commando Body: Earn the "Triple Kill" achievement.
Elite Commando Head: Earn the "Overkill" achievement.
Elite Commando Shoulders: Earn the "Killing Frenzy" achievement.
Elite Flight Body: Complete "Tsavo Highway" under the Heroic or Legendary difficulty.
Elite Flight Head: Complete Campaign mode under the Heroic difficulty.
Elite Flight Shoulders: Complete "The Ark" under the Heroic or higher difficulty.
Spartan EOD Body: Complete "Tsavo Highway" under the Legendary difficulty.
Spartan EOD Head: Complete Campaign mode under the Legendary difficulty.
Spartan EOD Shoulders: Complete "The Ark" under the Legendary difficulty.
Spartan EVA Body: Complete "Tsavo Highway" under the Normal or higher difficulty.
Spartan EVA Head: Complete Campaign mode under the Normal or higher difficulty.
Spartan EVA Shoulders: Complete "The Ark" under the Normal or higher difficulty.
Spartan Mark V Head: Earn the "UNSC Spartan" achievement.
Spartan ODST Head: Earn the "Spartan Graduate" achievement.
Spartan Rogue Head: Earn the "Spartan Officer" achievement.
Spartan Scout Body: Earn the "Too Close to the Sun" achievement.
Spartan Scout Head: Earn the "Used Car Salesman" achievement.
Spartan Scout Shoulders: Earn the "We're in for Some Chop" achievement.
Spartan Security Head: Earn 1,000 Gamerscore points.
Spartan Security Shoulders: Earn 250 Gamerscore points.

Skulls:

You can only claim/collect the skulls under the Normal, Heroic or
Legendary difficulty settings. You must start from the beginning of the
mission. You will not be able to see the skulls if you load from a
checkpoint. In Co-op mode, as soon as one player picks the skull up,
all players will receive the achievement. Not all skulls earn an
achievement; only nine of them do so. To use skulls, press X at the
lobby screen. This will give you a bonus multiplier for co-op and go
towards earning the Guerrilla, Demon, etc. achievements.

Black
Eye Skull: From the start of the "Crow's Nest" mission, without moving
anything, you can see a massive pipe above you. Walk up the stairs,
then up the next set. Turn to your left and jump up on the shelf unit.
From there, jump to the red cross beam then up onto the pipe. From
there, just walk to the end. Walk over the Black Eye Skull to claim it.
You do not have to pick this skull up, it does it automatically. Its
description reads "Bash your way to better health." Your shield will
not auto-recharge anymore, and you must kill an enemy with a melee
attack.

Blind Skull: In the "Sierra 117" mission, get to the
area where you see the Phantom overhead. A Marine will point it out.
Jump over the rocks and follow the path on the right. When you reach
the cliff, there will be a rock over the side. The skull is at the end
of the rock. Its description reads "Shoot from the hip". This skull
must be activated before you start a Campaign map.

Catch Skull:
In "The Storm" mission, do a grenade jump off a Warthog; or get a Ghost
and go back to the ramp from which you first appeared. Use the Ghost to
push a big square crate over to the front of the silo pod that has the
skull. Jump from the box to reach the skull. Its description reads
"Pull pin. Count to three. Throw." All NPCs will have two grenades and
will throw them frequently.

Cowbell Skull: In "The Ark"
mission, get a grav lift from the small building near where you fought
the Scarab. Continue through the mission until you reach the second
sloping hallway (stairway). Find the partitioned risers (platforms)
halfway down. The skull is on the top level. Throw the grav-lift on the
right side of the hall so that it ends up on the fourth small green dot
from the door. Get a running jump and use the grav-lift to boost you to
the top. You will get a checkpoint when you enter the room. Using this
skull will increase explosive force, similarly to the Sputnik Skull
from Halo 2.

Famine Skull: In "The Ark" mission, enter the
valley to the right after the wrecked Phantom. Look to the left to find
a large boulder. Use a Ghost to reach the side of the boulder that is
closest to the bridge overhead. Get the Ghost up the side of the wall
by using the thrust. Get two Ghosts up the wall to the top of the
bridge. Stack them on top of each other next to the beam where the
skull is located. Then, jump from the top of the Ghosts towards the
skull and land on the beam. Its description reads "Trust us. Bring a
magazine." Dropped weapons will have less ammunition.

Fog
Skull: In the "Floodgate" mission, while you are walking down from the
anti-air gun destroyed in the last mission, you will see a ramp next to
a missile launcher. Near this ramp is a checkpoint. After reaching it,
you will hear a Marine yell, "There! Over there!". Look up and to the
right at the roof of the building next to the missile launcher. There
is a lone Flood that is holding the skull. Kill him before he jumps. He
will drop the skull on the ground. Note: If you shoot too early the
skull will get stuck on the roof. Its description reads "You'll miss
those eyes in the back of your head." You will no longer have a motion
sensor.

Grunt Birthday Party Skull: Immediately after the first
objective of the "Crow's Nest" mission, while en route to the barracks
you will fall down to a pipe. Get to the end that pipe. Look over the
edge to find a small space a few feet below. Drop over then quickly
pull back to land under the floor you dropped from. The skull will be
at the end of this area. When this skull is active, headshots will
cause enemies to explode.

Iron Skull: After freeing Johnson and
killing all the Covenant that come in the Phantoms in the "Sierra 117"
mission, walk to the Pelican that arrives to pick you up. Face the
cargo bay, but instead of hopping in turn left and follow the path.
Once you hit the wall, jump up to your right to eventually reach a
walkway. Walk all the way to the end. Take a left, then a right. At the
end of this a little bit to the right is a dark corner. Press Up to
turn your light on and you should see the skull. If you cannot see it
you are probably standing on it. Its description reads "Death carries a
heavy price...". Instead of only losing 25 points when you die, you
will lose 75.

Mythic Skull: Follow the normal path in the
"Halo" mission until you reach a cave. Hug the right wall until it
branches off into a small path. At the end of this path is some rubble,
and in front is the skull. Its description reads "Coverage under the
Covenant health plan." It gives a 3x score multiplier for all kills.


Thunderstorm Skull: In "The Covenant" mission, shut down Tower 1 and
get access to the Hornet. Fly to Tower 2 (which is the one that the
Arbiter shut down). Go up the stairs. Go to the middle part that
connects both. There should be a stairway that leads up to a platform
where the skull is found. Its description reads "Field promotions for
everyone!" Enemies will be stronger.

Tilt Skull: In the
"Cortana" mission, enter the circular type room with all the Flood.
Look for a small structural piece next to two archways. Jump on top if
it then go up on the rocks to the top left. Turn to the left and jump
up again. Turn 180 degrees and jump to the rocks across from you. Then,
follow the rock that is sticking out and leads up on top of the
original circular room. The skull can be found in a pool of blood. Its
description reads "What was once resistant is now immunity." Enemies
now have different body parts that may be resistant to certain
ammunition.

Tough Luck Skull: Once you get past the part of the
map after you are forced to leave your vehicles, you will go through a
tunnel out onto an open "freeway". Immediately coming out of the tunnel
you will see a huge pipe with two yellow ladders. Climb the second
ladder. You should see a Regenerator power-up. Proceed to your right
onto a small platform ledge where the yellow chain link fence is
located. Jump onto that ledge, crossing over the fence. Directly behind
you should be a large column that is holding up the giant pipe you were
just on. Below that is a walkway. Fall off the ledge onto the walkway.
Walk to the end of that. You should see a hidden ledge with the "Tough
Luck" skull on it. A few attempts may be requires to jump across. Its
description reads "Your foes always make every saving throw".

Terminals:


Start "The Ark" mission. After entering the first building take a left
into another door. You will be in a curved corridor. On the inside is a
Terminal.

After activating the bridge in "The Ark" mission to
let your friends cross the gap, turn 180 degrees to find the Terminal.
Note: It does not open until you activate the bridge/

In the
third building after defeating the Scarab in "The Ark" mission, kill
the group of sleeping Covenant. Follow the corridor down. You will
reach a door in front that is locked. Immediately on the left is an
open door. Go through and walk straight off. Turn 180 degrees to find a
secret room with the Terminal.

Enter the first tower standing
on the lift in "The Covenant" mission. Face the access panel and turn
left. Jump over to find the Terminal.

Land your Hornet on the
second tower in "The Covenant" mission. Walk towards the entrance. When
you see the locked door, turn 180 degrees to find the Terminal.


When in the third tower standing on the lift in "The Covenant" mission,
face the access panel then turn right. Jump over to find the Terminal.


After reaching the end of the first cave in the "Halo" mission, hug the
right wall. You will see a building. Jump up onto the walkway and turn
to the left once you are inside to find the Terminal.

Alternate ending:
Complete the final mission under the Legendary difficulty setting.

Sierra 117: Monkeys with teddy bear:

After you come into contact with the snipers in the woods, follow along
the left rock path. You will find a strange family of monkeys holding a
teddy bear.

Smarter respawning:
When playing in Co-op
under the Legendary difficulty setting, it is best to have one player
keep their distance from the enemy at all times. By doing this, if the
rest of the players die they will respawn around the player that is
farther back, rather than having to restart the checkpoint.