Cheat list:

To activate cheat codes, go to OPTION\GAME OPTION and ENABLE CONSOLE, click YES.

In menu title press: ~ and type: developer 1 = enable cheat codes, LOAD button appears, click it and select the level. Once the level is loaded type ~ again and type "devmap" and you can use the following codes:
     
god = God Mode
give ammo = All Ammo
give all = All weapons, full ammo, health and armor
noclip = Walk through solid objects
notarget = Invisibility to most enemies
kill = suicide