At the mission selection screen, hold LT + RT + Back and slowly press Y, RB, Y, RB, X to unlock all missions. If you entered the code correctly, you will hear a sound.
Pause the game, then hold LT + RT + Back and slowly press Y(2), X, RB, X, LB. If you entered the code correctly, you will hear a sound.
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Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
Accomplish the indicated achievement to get Gamerscore points:
This trick can be done on any online level. First, get either smoke or frag grenades. Take out your Lancer and do an Active Reload then immediately switch to your grenades and press B when switching. Then, press RB(5) or RB(10), depending on the game. Next, throw your grenade. The ammo counter should read zero but you should be acting as if you are holding a grenade. Note: You can only tag people and if you switch weapons you will exit the glitch.
Successfully complete Campaign mode on the Casual or Hardcore difficulty setting to unlock Insane difficulty setting.
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Press Y to add 700 health.
Have all characters remain completely idle for approximately two minutes and all the walls will turn into exits.
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