Go into the game and press "~"

PAINKILLER - makes you immortal
TURTLE - restores health and armor
FUGITIVE - increases wanted level
LAWYERUP - decreases wanted level
LAWYERUP - recharges special abilities
LIQUOR - drunk mode
SLOWMO - slow motion mode
DEADEYE - slow aiming
CATCHME - fast running
GOTGILLS - fast swimming
HOPTOIT - super jump
SKYDIVE - gives a parachute
SKYFALL - flight
FLOATER - changes gravity
MAKEITRAIN - changes weather
SNOWDAY - vehicle drift
HOTHANDS - explosive strikes
HIGHEX - explosive ammunition
FIRE - incendiary bullets
TOOLUP - gives all weapons in the game