At the 'Main' menu go to 'Options' and then 'Cheat Codes' and enter the following codes to unlock the corresponding effect in the game. If you enter the code correctly the word 'On' will appear on the screen. When these codes are enabled the game cannot be saved.

Unlock ALL Levels:
Enter X, Y, Up, Left, LB(2), RT, X, Y, LT.

Unlock ALL challenges:
Enter Right, LB, LT, X, Left, RB, RT, Y, LT, X..

Unlock ALL Awesomeness:
Enter RB(2), Down, Left, Up, RT, X, RB, X(2).

Unlock ALL Tricks:
Enter LB, RT, Y, Up, Down, X, LT, Left, RB, RT.

Unlock ALL Gear:
Enter Y, Down, Up, Left, Right, LB, Right, RT(2), RB.

Unlock ALL Sleds:
Enter RT, X, LT, Down, Right, LB, LT, RT, Y, X.

Unlock ALL Build Licenses:
Enter Left, RT, LB, RT, X(2), Y, Down, Up, X.

Unlock ALL Build Objects:
Enter LT, RT, Up(2), RB, Left, Right, X, Y, LB.

Unlock ALL Music:
Enter Up, Left, RT, RB, RT, Up, Down, Left, Y, LT.

Unlock All sleds:
At the 'Cheat Codes' screen under the 'Options' menu enter RT, X, LT, Down, Right, LB, LT, RT, Y, X as a code.