Unlock all challenges
Enter "DOUBLEBARREL" as a rider name on the new profile screen.
Unlock all riders
Enter "BUBBA" as a rider name on the new profile screen.
Unlock all tracks
Enter "ROADKILL" as a rider name on the new profile screen.
Unlock all tricks
Enter "FIDDLERSELBOW" as a rider name on the new profile screen.
Unlock all vehicles
Enter "GENERALLEE" as a rider name on the new profile screen.