At the Game mode screen enter the following code. R, U, B, B, A, B, U, B, B, A

Achievements
Complete the folloing tasks to unlock the corresponding amount of Points

Challenge Expert - 30 Points:
50 challenges completed

Extreme Bike Collector - 50 Points:
Purchase ALL Extreme Bikes

Challenge Master - 60 Points:
ALL Challenges completed

Accredited - 100 Points:
ALL Rider Credits awarded

Stunt Mode Rider - 10 Points:
Win a Stunt mode game in any Multiplayer mode

GP Rookie - 10 Points:
Win a Career mode Grand Prix season on Rookie difficulty

Extreme Mode Champion - 10 Points:
Win any Extreme mode championship on any difficulty

Extreme 1200 - Professional - 25 Points:
Win a Career mode Extreme 1200 Season on Pro difficulty

GP Professional - 30 Points:
Win a Career mode Grand Prix season on Pro difficulty

Extreme 1200 - Champion - 50 Points:
Win a Career mode Extreme 1200 Season on Champion difficulty

GP Champion - 60 Points:
Win Career mode Grand Prix Season on Champion difficulty

Extreme 600 - Legend - 30 Points:
Win a Career mode Extreme 600 Season on Legend difficulty

Extreme 1000 - Legend - 60 Points:
Win a Career mode Extreme 1000 Season on Legend difficulty

Extreme 1200 - Legend - 75 Points:
Win a Career mode Extreme 1200 Season on Legend difficulty

GP Legend - 100 Points:
Win a Career mode Grand Prix Season on Legend difficulty

Seeded #1 - 75 Points:
Seed #1 achieved

Seeded #10 - 50 Points:
Seed #10 achieved

Seeded #25 - 30 Points:
Seed #25 achieved

Seeded #50 - 20 Points:
Seed #50 achieved

Seeded #75 - 15 Points:
Seed #75 achieved

Seeded #90 - 10 Points:
Seed #90 achieved