Pause the game and then enter Cheats. At the cheats menu, select Enter Cheat Code and enter the following passwords to unlock the cheats:
Enemies Thawed/Frozen: DONTFARTONASCAR
Fill Bloodlust: ANGRYXXXINSANEHOOKER
God Mode: TRIASSASSINDONTDIE
Gratuitous Dismemberment: INSANEGIBSMODEGOOD
Juggy Mode: JUGGYDANCESQUAD
Restore Health: LAMEYANKEEDONTFEED
Show Weapons: SHOWMEMYWEAPONS
Time Factor: NAKEDNASTYDISHWASHERDANCE