USA Extreme bike
At the "Game Mode" screen, press Right, Up, B(2), A, B, Up, B(2), A to unlock the USA Extreme bike.

50th Anniversary bike (yellow/white with black bar stripe)
Set your season to 2005 under the "Season" option. Then, win a Quick Race with Valentino Rossi at Laguna Seca to unlock the 50th Anniversary bike (yellow/white with black bar stripe).

50th Anniversary bike (red/white/green)
Set your season to 2005 under the "Season" option. Then, win a Quick Race with Valentino Rossi at Valencia to unlock the 50th Anniversary bike (red/white/green).

Quick Race Extreme mode and tracks
Win a Quick Race in GP mode with Valentino Rossi to unlock Quick Race Extreme mode and tracks.

Extreme mode 600cc-1200cc
Repeat all seventeen tracks to unlock more Extreme mode tracks.

Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Accredited (100 points): All rider credits awarded.
Challenge Expert (30 points): 50 Challenges completed.
Challenge Master (60 points): All Challenges completed.
Extreme Bike Collector (50 points): Buy all extreme bikes.
Extreme Mode Champion (10 points): Win any Extreme mode championship.
Extreme 1000 - Legend (60 points): Win a Career mode Extreme 1000 season on the Legend difficulty setting.
Extreme 1200 - Champion (50 points): Win a Career mode Extreme 1200 season on the Champion difficulty setting.
Extreme 1200 - Legend (75 points): Win a Career mode Extreme 1200 season on the Legend difficulty setting.
Extreme 1200 - Professional (25 points): Win a Career mode Extreme 1200 season on the Pro difficulty setting.
Extreme 600 - Legend (30 points): Win a Career mode Extreme 600 season on the Legend difficulty setting.
GP: Champion (60 points): Win a Career mode Grand Prix season on the Champion difficulty setting.
GP: Legend (100 points): Win a Career mode Grand Prix season on the Legend difficulty setting.
GP: Professional (30 points): Win a Career mode Grand Prix season on the Pro difficulty setting.
GP: Rookie (10 points): Win a Career mode Grand Prix season on the Rookie difficulty setting.
Seeded #1 (75 points): Seed #1 reached.
Seeded #10 (50 points): Seed #10 reached.
Seeded #25 (30 points): Seed #25 reached.
Seeded #50 (20 points): Seed #50 reached.
Seeded #75 (15 points): Seed #75 reached.
Seeded #90 (10 points): Seed #90 reached.
Stunt Mode Rider (10 points): Play a Stunt mode game in Multiplayer mode.
Finish 50 races (20 points): Finish 50 races (Xbox Live or offline).
Finish 100 races (30 points): Finish 100 races (Xbox Live or offline).
Finish 250 races (30 points): Finish 250 races (Xbox Live or offline).
Finish 500 races (50 points): Finish 500 races (Xbox Live or offline).

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