MotoGP 06 (Xbox 360)

CheatingDome.com

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.

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.

Extreme mode 600cc-1200cc

Repeat all seventeen tracks to unlock more Extreme mode tracks.

Quick Race Extreme mode and tracks

As Valentino Rossi, win Quick Race in GP mode.

USA Extreme bike

Press Right, Up, B(2), A, B, Up, B(2), A at the "Game Mode" screen.

Various Achievements

Complete the following achievements to unlock the indicated number of Xbox Live Gamerscore points.

AchievementHow to unlock
Accredited (100 points)All rider credits awarded.
Challenge Expert (30 points)50 Challenges completed.
Challenge Master (60 points)All Challenges completed.
Extreme 1000 - Legend (60 points)Win a Career mode Extreme 1000 season under the Legend difficulty.
Extreme 1200 - Champion (50 points)Win a Career mode Extreme 1200 season under the Champion difficulty.
Extreme 1200 - Legend (75 points)Win a Career mode Extreme 1200 season under the Legend difficulty.
Extreme 1200 - Professional (25 points)Win a Career mode Extreme 1200 season under the Pro difficulty.
Extreme 600 - Legend (30 points)Win a Career mode Extreme 600 season under the Legend difficulty.
Extreme Bike Collector (50 points)Buy all extreme bikes.
Extreme Mode Champion (10 points)Win any Extreme mode championship.
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 50 races (20 points)Finish 50 races (Xbox Live or offline).
Finish 500 races (50 points)Finish 500 races (Xbox Live or offline).
GP: Champion (60 points)Win a Career mode Grand Prix season under the Champion difficulty.
GP: Legend (100 points)Win a Career mode Grand Prix season under the Legend difficulty.
GP: Professional (30 points)Win a Career mode Grand Prix season under the Pro difficulty.
GP: Rookie (10 points)Win a Career mode Grand Prix season under the Rookie difficulty.
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 multi-player mode.