Codes and Concept Art
To unlock certain cheats (such as infinite health, infinite ammunition and more), and to unlock a plethora of concept art from the game's development, complete the game once through in its entirety.
Completion bonuses
Complete campaign mode to unlock the following.
Unlimited health,Unlimited grenades and double your health regeneration - Complete the game
Environmental character and weapon concept art at the extras menu - Complete the game
Codes and Concept Art...