The Bourne Conspiracy (Xbox 360)

Silenced Machinegun
To unlock a silenced machinegun, head to the in-game cheats menu and insert the following password: whattheymakeyougive.

Automatic Shotgun
To replace your assault shotgun with an automatic shotgun, head to the in-game cheats menu and insert the following password: alwaysanobjective.

Bonus Music Track
To unlock a bonus music track, head to the in-game cheats menu and insert jasonbourneisdead.

More Concept Art
To unlock more concept art than is otherwise available to you, head to the in-game cheats menu and insert lastchancemarie.

Hint: Even The Odds
After you get Castel's health down a certain amount he pulls out a knife. This gives Castel an edge in combat. You can disarm him though, by moving the fight over to the desk.

Once you are in front of the desk perform a takedown, and if Jason is in the right spot, he will stab Castel with a ball-point pen. Castel does less damage without the knife, but you need to do a takedown near the desk to disarm him. Any other location will allow Castel to keep his weapon.