Elite Armour

Unlock Ascetic Body - Get the 'Up Close and Personal' Achievement.

Unlock Ascetic Head - Get the 'Steppin' Razor' Achievement.

Unlock Ascetic Shoulders - Get the 'Overkill' Achievement.

Unlock Commando Body Unlock 'Triple Kill' Achievement.

Unlock Commando Head - Get the 'Overkill' Achievement.

Unlock Commando Shoulders - Get the 'Killing Frenzy' Achievement.

Unlock Flight Body - Complete Tsavo Highway On Herioic or Legendary.

Unlock Flight Head - Complete Campaign mode on Heroic difficulty.

Unlock Flight Shoulders - Complete The Ark on Heroic difficulty or higher.


Spartan Armour

Unlock EOD Body - Complete Tsavo Highway on Legendary difficulty.

Unlock EOD Head - Complete Campaign mode on Legendary difficulty.

Unlock EOD Shoulders - Complete The Ark on Legendary difficulty.

Unlock EVA Body - Complete Tsavo Highway on Normal or higher difficulty.

Unlock EVA Head - Complete Campaign mode on Normal difficulty.

Unlock EVA Shoulders - Complete The Ark on Normal difficulty or higher.

Unlock Hayabusa Chest - Collect 5 hidden skulls.

Unlock Hayabusa Helmet - Collect 13 hidden skulls.

Unlock Hayabusa Shoulders - Collect 9 hidden skulls.

Unlock Mark V Head - Get the 'UNSC Spartan' Achievement.

Unlock ODST Head - Get the 'Spartan Graduate' Achievement.

Unlock Rogue Head - Get the 'Spartan Officer' Achievement.

Unlock Scout Body - Get the 'Too Close to the Sun' Achievement.

Unlock Scout Head - Get the 'Used Car Salesman' Achievement.

Unlock Scout Shoulders - Get the 'Mongoose Mowdown' Achievement.

Unlock Security Head - Get 1000 GamerScore points.

Unlock Security Shoulders - Get 750 Gamerscore points.


Unlock Katana:
When you've completed ALL the Achievements and found ALL the skulls Katana

The following cheats can be performed during a local match or replay only. PRESS & HOLD the following buttons for 3 SECONDS to turn the effect on / off
LB = Left Bumper
RB = Right Bumper
LS = Click in on Left Analog Stick
RS = Click in on Right Alalog Stick

Code
Effect
LB + RB + LS + A + DOWN [D-PAD] Hide Weapon
[HOLD LS + RS] Press Left on D-Pad Pan-Cam / Normal while Show Corrdinates is enabled. LB + RB + LS + A + UP [D-PAD] Show Coordinates / Camera Mode

Load up your level Highground, and go to the end of the map where the sniper rifle is. Be sure you have a M90 shotgun with you. Then jump and have the other player sword climb you and you will reach a cliff a slanted one, then you can go around other cliffs!

I'm going to teach you how to use the hammer slammer technique.

First, you're going to need a Gravity Hammer.

Second, you must do something to flip a small vehicle over, like a Mongoose, Ghost or Banshee(you can also do another trick with a Banshee and a rocket launcher, but that's for later.) I suggest meleeing the vehicle with a melee weapon like a plasma sword or flipping it with a grenade. Now, jump on top of the capsized thing, and take out your hammer. Look down, and fire! Not only will you cause unnecessary carnage, you will be thrown into the air so high up, chances are you will die from the fall. It's a hell of a trick, but it's fun!

Now for the Double jump.

First, have someone jump onto your head(This is still possible in Halo 3) and jump. Now, after he jumps, you jump. This will give your friend a place to land when he hits the top of his jump, and now he can jump again, doubling the height of the leap! This is useful for reaching hard-to-reach places like corridors placed 10 meters up above your head, where you can't rech normally without a friend. Happy Hellraising!

Requirements:Banshee
Wraith
A map like Valhalla (because I didn't try other maps)
Instructions: Well, this is something I found while playing with my friend. If you keep boosting (dont let go of boost), let the wraith shoot you while you are boosting. Then when the banshee dies, you should still see the banshee boosting. It's a quite funny glitch because the banshee never came back for the whole game.. So it was a race for me and my friend to get the other banshee

Alright, here's what you do. Go on to Forge mode on the map: Last Resort.
Then, spawn a tank near the spinning wheel. Get inside of it, and get in the path of it going up, start moving forward and when you hit the little edge halfway there, you will go flying into the air while spinning.

P.S. This worked better on Halo 2, but at least they didn't fix the glitch!
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Above submission added on: 10th Jan 2008 | id number: 1990