No original cheatcodes, but you can enable cheats from the console (tilde key:

bEnableCheats=3

Then you can access the cheats menu, or use the hotkeys.
G - God mode
J - Tyrbo mode
K - Kill all enemies
U - Auto aim
Y - NoClip
O - all weapons
L - Fly mode

Didn't realize it were that easy, thank you!

cht_bEnableCheats=3

Thank you!