Use the following codes to enable the corresponding effect:
One Shot Kills: Circle, L2, Down, R1, X
Invincibility: Up, Square, Circle, X, Down
Grenades: X, Circle, Square, L2, R1
Extra Features: Left, R1, L1, Down, Circle
Unlimited Ammo: L1, L2, X, R2, R1
All Acts: R2, Right, L2, Up, Square