Cheats:
Infinate Life And Ammo
Pause the game and press Triangle, Triangle, X, X, L2, R2, R1, R2, Circle, Square.
Unlockables:
All primary weapons*
Successfully complete the game under the Recruit or Contractor difficulty setting to unlock the primary weapons.
All secondary weapons*
Successfully complete the game under the Professional difficulty setting.
All basic weapons*
Successfully complete the game under the Professional difficulty setting.
All other weapons*
Successfully complete the game under the Operative difficulty setting.
“Professional” difficulty level
Successfully complete the game under the Recruit or Contractor difficulty setting.
*Unlocked weapons have no upgrades.