God Mode For You
Pause the game and press L1, R2, L2, R1, SELECT. This only applies to the character that you have selected; your other teammates can be killed.
Unlock All Missions
To unlock all missions, go to the title screen and press X, L2, TRIANGLE, R2, SELECT.
Unlock All Special Features
To unlock all special features, press L1, L2, R1, R2, X, SELECT at the title screen.