Start the game with the "avp.exe -debug" command line parameter.
Then while playing a game, press "~" to display the console.
Then enter one of the following codes while playing as the indicated character
(Marine, Predator, Alien or Any) to activate the corresponding cheat function
(all character must be capital letters):
Alien:

CROUCHMODE 0/1-Toggle Crouch and Crawl off/on

Any Character:

ALIENBOT-Create CPU-Controlled Alien

GIVEALLWEAPONS-All Weapons and Ammo

GOD-God Mode

LIGHT-Create Light Aura (Input Again for Brighter)

LISTVAR-In-Game Help

LISTCMD-List Cheat Codes

MARINE BOT #-Create # of Marine Bots

PREADOBOT #-Create # Of Predator-Alien Bots

PREDALIENBOT-Create CPU-Controlled Predator-Aien

PRAETORIANBOT-Create CPU-Controlled Praetorian-Alien

SHOWFPS-Show Framerate

SHOWPOLYCOUNT-Show Rendered Polys

TIMESCALE #-Change Game Speed (# = 0.00 and 1.00)

XENOBORG-Create CPU-Controlled Xenoborg

Marine:

MOTIONTRACKERVOLUME #-Change Motion Tracker Volume (# = 0.00 to 1.00)


MOTIONTRACKERSPEED #-Change Motion Tracker Speed (# = 1 to 16)

Predator:

GIMME_CHARGE-Replenish Energy Supply

Note: You cannot save your game with -debug activated.