Cheat List
To unlock these cheats, go to Profile Editor, then Unlock Items, then Cheat Codes.
Enter the phrases to unlock the listed cheats:

Everything: IGIVEUP
1000 Profile Points: GIMMEPTS
Aggressive CPU Riders: EATDIRT
All ATVS: SHOWROOM
All Games: GAMEON
All Tracks: TRLBLAZR
All Equipment: THREADS
All Championships: GOLDCUPS
Disable Wrecks: FLYPAPER
Unlock San Jacinto Isles: GABRIEL

Unlock Ravage ATVs
To unlock Ravage ATVs, complete the training course.

Unlockable: Ravage ATVs
To unlock Ravage ATVs, complete the training course.

Unlockable: Extra ATV Gear
If you have ATV Offroad Fury 1 data on your memory card, you will have access to the special G-Ride ATV and gear when you start your ATV 2 game.

Hint
To unlock the blue, green, red, and yellow Ravage successfully complete the training course.

Points for Wheelies
Get points for doing wheelies: GETONUP

Unlock All Bikes
Enter SHOWROOM at the cheats menu

Unlock Everything
Enter IGIVEUP at the cheats menu

Cheat List 2
Action Replay Camera: STOPCAM
All out AI Enabled/Disabled: BRINGIT
Switched Aspect Ratio: WIDESCRN

Aggresiveness
Either "Bringit" or "Eatdirt" entered at cheat menu shoul work

ATV Off Road Fury 2
A cheat is I give up

Atv off road fury 3
No skills
rocknroll
fits
snowbats
mixmatch
enviroment
ihick=rubber
impatient
slacker
g-ride