All Boards for Every Character:
Enter the password graphicdelight.You can equip them in 'Boards' under 'Equip Gear' after you select your character.

Eddie:
Enter the password worm.You'll find him in 'cheat character' under 'Rider Detail.'

Brodi:
Enter the password zenmaster.You'll find him in 'cheat character' under 'Rider Detail.'

Luther:
Enter the password bronco.You'll find him in 'cheat character' under 'Rider Detail.'

Bunny San:
Collect all art.

All Posters:
Enter the password postnobills. You can view the posters in 'Rewards' under 'Rider Details' in any lodge.

Thanks to Revolution readers Eek, Bronson, Jacob Love and warner12!