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Start the game with the "avp.exe -debug" command line parameter.
Now open the console and type in the codes (Attention, saving the game is not possible in debug mode):

All characters:

GOD                     Invulnerability
GIVEALLWEAPONS          All weapons
ALIENBOT                Spawns an alien
MARINEBOT               Spawns a Marine
PREDOBOT                Spawns a Predator
PREALIENBOT             Spawns a Predator alien
PRAETORIENBOT           Spawns a Praetorien lien
XENOBORG                Spawns a Xenoborg
LIGHT                   Spawns light
OBSERVER                Invisibility
SHOWCOORDS              Show coordinates
SHOWFPS                 Frame rate
SHOWPOLYCOUNT           Polygone countzer
LISTCMD                 List of cheats
LISTVAR                 Online help
TIMESCALE      Changes game speed
SKY_RED                 More red to the sky
SKY_BLUE                More blue to the sky
SKY_GREEN               More green to the sky
LEANSCALE               Changes sidestep range
CALVINRULEZ             Greetings from the programmer

Alien only :

THEONEDEADLYCREAUTUREEVERCREATED       Invulnerability
WINNEROFTHEONEGREATBATTLEOFTHEUNIVERSE Invulnerability
CROUCHMODE                     Crouch and crawl mode ON/OFF

Marine only:

FREAKOFTHEUNIVERS                 Invulnerability
MOTIONTRACKERVOLUME    Volume of the motion tracker
MOTIONTRACKERSPEED          Speed of the motion tracker

Predator only:

SKULLCOLLECTOR                    Invulnerability
GIMME_CHARGE                      Full energy