While playing, press [~] to bring up the console, then type in:

 GIFTFROMPTERODON       Enable Cheat Mode

 CHTHEAL                Restore Health
 CHTHEALTEAM            Restore Health for Team
 CHTWEAP #              Get Weapon # (0-30)
 CHTAMMO                Refill Ammo
 CHTGRENADES            Get Grenades
 CHTALLQF               Access Quickfights
 CHT3PV (0/1)           3rd Person View
 SHOWFPS (0/1)          Show FPS
 SHOWPROF (0/1)         Show Stats
 CHTCANNIBALS           Indian masks
 CHTKOSTEJ              Invulnerability