Get Unlimited Grenades:
Go to the cheats screen at the options menu and put in Circle, X, Circle, Square, X, Circle, X, Circle

Get Max health:
Go to the cheats screen at the options menu and put in X, X, Square, Triangle, Square, Triangle, Circle

Get Crazy Deaths:
Go to the cheats screen at the options menu and put in Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle

Get Rain of Fire:
Go to the cheats screen at the options menu and put in Square, Square, Square, Square, Square, Square, Square, Square

Get Rapid Rails:
Go to the cheats screen at the options menu and put in Circle, Square, Circle, Square, X, X, Triangle, Triangle

Get Director's Cut:
Go to the cheats screen at the options menu and put in Square, X, Circle, Triangle, Circle, X, Square, Triangle

Get Gibby Explosions:
Go to the cheats screen at the options menu and put in Triangle, Circle, X, Square, Triangle, Circle, X, Square

Get Unlimited Ammo:
Go to the cheats screen at the options menu and put in Square, Triangle, X, Circle, Square, Circle, X, Triangle

Get Walking Dead:
Go to the cheats screen at the options menu and put in X, X, X, X, X, X, X, X