Unlimited Health
Pause the game and hold Left Trigger and enter the following commands: Y, X, Y, X, Y, B, Y, B.

Unlimited Ammo
Pause the game and hold Left Trigger and enter the following commands: Left, B, Right, X, Up, Y, Down, A.

Unlimited Rage
Pause the game and hold Left Trigger and enter the following commands: Left, Down, Left, Down, Right, Up, Right, Up.

God Mode, Friendlies
Pause the game and hold Left Trigger and enter the following commands: X, B, Y, A, X, B, Y, A.
(This only works on levels where you are escorting people)

Access All Missions
At the main menu hold Left Trigger and enter the following commands: Down, Up, Left, Left, B, Right, Down, X.

Access All Weapons
At the main menu hold Left Trigger and enter the following commands: X, B, Down, Left, B, B, Y.

Unlock Daywalker Difficulty
At the main menu hold Left Trigger and enter the following commands: Left, B, Up, Down, X, B, A.