MotoGP '06 - Platform: Xbox 360

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).