ShellShock: Nam '67 cheats and cheat codes for XBox

Press the following button combinations on your Xbox controller, while you are 
at the "press start" (title) screen.

God Mode
Enter the following button combinations in the "press start" screen:
Click Right analog-stick, Click Left analog-stick, RIGHT, LEFT, L, R, Click 
Right analog-stick, Click Left analog-stick, RIGHT, LEFT, L, R to get access 
to the invincible mode.

Get Infinite Ammo
Enter the following button combinations in the "press start" (title) screen:
BLACK, R, Y, WHITE, L, UP, BLACK, R, Y, WHITE, L, UP to get unlimited 
ammunition.

Unlock acid Trip Mode
Enter the following button combinations in the "press start" (title) screen:
Up, Black, B, Left, Y, X , White, L, B , R to get access to acid trip mode.

Unlock all Missions and Pictures
Enter the following button combinations in the "press start" (title) screen:
WHITE, BLACK, L, R, L, WHITE, WHITE, BLACK, L, R, R, BLACK to get access to 
all levels and images.

Enable weapons option when paused
Enter the following button combinations in the "press start" (title) screen:
UP, DOWN, LEFT, RIGHT, B, X, UP, DOWN, LEFT, RIGHT, B, X to get access to add 
weapons options when the game paused.