Cheat Codes:
Press [~] to get into the console. Type “devmap mak” and press [Enter] to enable cheat mode.

All weapons:
give all
Change maps:
devmap [map name]
Disable AI:
notarget
God mode:
god
List maps:
mapname
No clipping mode:
noclip

Unlockables:

Veteran mode:
Reach level 32

Zombie mode:
Complete Campain mode succesfully