Full list of all 24 MotoGP '06 achievements worth 1,000 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
Finish 500 races, online or offline
All rider credits awarded
Purchase all extreme bikes
Seed #1 achieved
Finish 250 races, online or offline
Win a Career mode Grand Prix season on Legend difficulty
Win a Career mode Grand Prix season on Champion difficulty
Win a Career mode Extreme 1200 season on Pro difficulty
Win a Career mode Extreme 1200 season on Champion difficulty
Win a Career mode Extreme 1200 season on Legend difficulty
Win a Career mode Extreme 1000 season on Legend difficulty
Seed #10 achieved
Win a Career mode Extreme 600 season on Legend difficulty
Seed #25 achieved
Play a 'Stunt mode' game in any Multiplayer mode
Seed #50 achieved
Win any Extreme mode championship, at any difficulty
All Challenges completed
Finish 50 races, online or offline
50 Challenges completed
Win a Career mode Grand Prix season on Pro difficulty
Seed #75 achieved
Win a Career mode Grand Prix season on Rookie difficulty
Seed #90 achieved