The Cheat Codes screen in found under the Options menu.
Always Awesome:
Press Up, RT, X, Y, LB, X, Down, LB, RT, RB at the cheat codes screen.
All levels:
Press X, Y, Up, Left, LB, LB, RT, X, Y, LT at the cheat codes screen.
All gear:
Press Y, Down, Up, Left, Right, LB, Right, RT, RT, RB at the cheat codes screen.
All tricks:
Press LB, RT, Y, Up, Down, X, LT, Left, RB, RT at the cheat codes screen.
All music:
Press Up, Left, RT, RB, RT, Up, Down, Left, Y, LT at the cheat codes screen.
All challenges:
Press Right, LB, LT, X, Left, RB, RT, Y, LT, X at the cheat codes screen.
All configs:
Press Down, X, Right, LB, Right, RB, X, RT, LT, Y at the cheat codes screen.
All Awesomeness-es:
Press RB, RB, Down, Left, Up, RT, X, RB, X, X at the cheat codes screen.
All build licenses:
Press Left, RT, LB, RT, X, X, Y, Down, Up, X at the cheat codes screen.
All build objects:
Press LT, RT, Up, Up, RB, Left, Right, X, Y, LB at the cheat codes screen.
All Sleds:
Press R, X, L, Down, Right, LB, L, R, Y, X at the cheat codes screen.
Disable AI:
Press X, X, LB, Down, Right, Right, Up, Y, Y, LT at the cheat codes screen.
Low gravity:
Press RT, Down, Down, Up, X, LB, Y, RT, Y, Down at the cheat codes screen.
Super spins:
Press X, X, X, X, Y, Y, Y, X at the cheat codes screen.
Loud speakers:
Press Y, RT, RT, LB, Down, Down, Left, Left, Right, LB at the cheat codes screen.