Daywalker Difficulty:
     At  the  main  menu  press  and hold the Left Trigger, then press
LEFT, B, UP, DOWN, X, B, A

Infinite Ammo:
     At  the  main  menu  press  and hold the Left Trigger, then press
LEFT, B, RIGHT, X, UP, Y, DOWN, A

Infinite Health:
     At the main menu press and hold the Left Trigger then press Y, X,
Y, X, Y, B, Y, B

Infinite Rage:
     At the main menu press and hold the Left Trigger then press LEFT,
DOWN, LEFT, DOWN, RIGHT, UP, RIGHT, UP

Invincibility For NPCs (Non-Player Characters):
     To  make  your NPC character's invincible during escort missions,
go  to the main menu and press and hold the Left TriggerThen press: X,
B, Y, A, X, B, Y, A.

All Missions:
     At the main menu press and hold the Left Trigger then press DOWN,
UP, LEFT, LEFT, B, RIGHT, DOWN, X

All Weapons:
     At the main menu press and hold the Left Trigger then press X, B,
DOWN, LEFT, B, B, Y