Enter these cheats on the 'Codes' menu Selected from story mode main menu:

IPULATOR = Unlock all levels
DEXTERCROWLEY = Unlock all movies
SIRULLY = Unlock all gallery
DOGTAGS = Unlock all skills
SHARDESOFGLASS = Unlock Black Book
STATEYOURNAME = Unlock all characters
BABYLONTRUST = Max health
VANCEDALLISTER = Max skills
MARCUSECKOS = Infinite health
FLIPTHESCRIPT = Infinite skills
GRANDACELIA = iPod (?)
NINESIX = Unlock all legends
WORKBITCHES = Unlock all beat down arenas