These are some cheats that i have found in the game in all my time of playing it.

Fill Bloodrage: ANGRYXXXINSANEHOOKER
-This one fills your bloodrage, and is accessible from the cheat menu. Though it does not work when you are in bloodrage mode.
Freeze Enemies: DONTFARTONOSCAR
-This makes it so that in the cheat menu you can either choose to freeze or thaw the enemys. Making them stay, or move. The nice thing is that if they are frozen every time you attack one you will slice them to peices in the first shot every time. Though it does stop working a lot in the last battle. Just thaw them, and freeze them again.
God Mode: TRIASSASSINDONTDIE
-Same as in all other games God Mode=invulnerability.
Regain Health: LAMEYANKEEDONTFEED
-This one allows you to go to the cheats menu and refill your health. But It is not a permanent thing, so if you cannot play the game and need this one. You will be spending a lot of time in the cheat menu.
Show Weapons: SHOWMEMYWEAPONS
-This one is kinda cool. It should be obvious what it does. This one allows you see where bloodrayn keeps her weapons, and allows you to see them.
Time Factor: NAKEDNASTYDISHWASHERDANCE
-This changes the speed of the game.