Cheat Codes
Enter these cheats on the Pause menu screen. The cheats marked with a * should be entered in the Title Menu screen. Before entering them, be sure to set the control type to 'Keyboard' in Control Options, otherwise they wont work:

All combo moves
Use the follow key commands: [Right] [Down] [Up] [Down] [Down] (Feed) (Lift Attack) (Telekinesis) [Down]

Full health and TK meter
Use the follow key commands: [Left] [Left] [Up] [Up] (Autoface) (TK Aim) (Telekinesis) [Down] (Lift Attack)

Full health, TK, and Reaver meters
Use the follow key commands: [Left] [Right] [Left] [Right] (Feed) (Autoface) (Telekinesis) (Lift Attack) [Down]

Cardboard tube Reaver
Use the follow key commands: [Up] [Down] [Left] [Right] (TK Aim) (Lift Attack) [Down] (Telekinesis)

All bonus materials
Use the follow key commands: [Down] (Telekinesis) [Up] [Left] [Right] [Right] (Lift Attack) [Down] [Right] [Right]

All Dark Chronicles
Use the follow key commands: (Feed) [Down] (TK Aim) (Autoface) [Right] (TK Aim) (Lift Attack) [Down] (Autoface)

Vehiculum Furtus Maximo Kain and Toon Raziel
Use the follow key commands: [Up] [Down] [Up] [Down] (Feed) (TK Aim) [Down] (Telekinesis) (Lift Attack)

No texture
Use the follow key commands: (Autoface) [Down] (TK Aim) [Right] (TK Aim) [Up] (Lift Attack) (Autoface) [Down]

Wireframe mode
Use the follow key commands: (Autoface) [Down] (Autoface) [Up] (Feed) (Autoface) [Down] (Lift Attack)

Invincibility
Use the follow key commands: [Up] [Down] [Right] [Down] (Feed) (TK Aim) [Down] (Lift Attack) (Autoface)

Unlimited Reaver charge
Use the follow key commands: [Down] [Down] [Up] [Left] (Feed) (TK Aim) [Down] (Lift Attack) (Telekinesis)

Bonus materials:
Save the game after completing it to unlock all bonus materials.