Various cheats
From the Main Menu, select Load Game > (Load Any Profile) >
Options > Codes. Enter any of the following cheat codes using the
arrow keys or gamepad. Enter the code again to disable.

Note: The status of every cheat code is saved to your profile. So
if you quit the game and then reload it, all of your previously
enabled cheats will remain active (until you manually disable them by
entering them again in the Codes menu). All content that was unlocked
by a cheat code will be re-locked if you disable that cheat, unless
you have already unlocked that content by natural means (like playing
the levels without cheating).

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