From the Menu, select Options > Codes. Enter any of the following cheat codes. Enter the code again to disable.

Code - Effect

IPULATOR - Unlock All Levels
NINESIX - Unlock All Legends
STATEYOURNAME - Unlock All Beat Down Characters
WORKBITCHES - Unlock All Beat Down Arenas
SHARDSOFGLASS - Unlock All Black Book Graffiti
GRANDMACELIA - Unlock All iPod Songs
FLIPTHESCRIPT - Activate Infinite Skillz
MARCUSECKOS - Activate Infinite Health
VANCEDALLISTER - Max Out Skills Meter
BABYLONTRUST - Max Out Health Meter
DOGTAGS - Unlock All Combat Upgrades
SIRULLY - Unlock All Concept Art
DEXTERCROWLEY - Unlock All Movies