At the Main menu enter Square, Triangle, Left, Left, Circle, Circle, L, R, R, Triangle.

Unlock ALL Expert Levels:
Beat the Normal Level with a Gold cup.

Unlock Ice Tournament:
On Expert Level get a Gold Cup in Amatuer National


Profile Password:
At the 'Main' menu go to 'Options' and then 'Player Profile'. From there go to 'Enter Cheat' and input the following case sensitive passwords to unlock the corresponding effect.

Gets you 1500 Credits:
$moneybags$

Unlock ALL ATVs except the Fury bike and the G-Ride:
TO LAZY

Unlock everything except the Fury Bike:
All Access

Unlock Ravage Talon ATVs:
+THREE

Unlock ALL Bike Parts:
TRICK IT OUT

Unlocks ALL Rider Gear:
Duds

Unlocks Rims:
Dubs

Unlock ALL Events:
N0GAME

Unlock ALL Exhausts:
SMOG TEST

Unlock ALL Music Videos:
Billboards