Enter the following cheats during game play, not paused.

Code Effect

L, Select, Square, Down, L, Right 100% completion in story mode
Down, Square, X, Select, R, Left Complete current mission
Circle, Circle, Circle, L, Select, Triangle Get Brass Knuckles
Down, Down, Select, Up, Up, L Get knife
L , X , R(2), Select, R Receive a Machete
L, L, Circle, Up, Circle, Select Unbreakable Bat
Up, Triangle, R, Select, X, L Unlimited Health
Square, Circle, Triangle, Select, X, Left Unlimited Rage
L, X, R , L, L, Circle Upgrade Flash Capacity