Full list of all 27 Import Tuner Challenge achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Raced the All clockwise roads under 16'30"000.
Raced the All counter clockwise roads under 16'30"000.
Raced the Shinjuku 4 under 6'00"000.
Raced the Shibuya 3 under 3'30"000.
Raced the Shinkanjo clockwise under 6'00"000.
Raced the Shin Kanjo counter clockwise under 6'00"000.
Raced the C1 outside under 5'00"000.
Raced the C1 inside under 5'00"000.
Defeated King Speed.
Defeated D3.
Defeated Melancholy Angel.
Defeated Crimson Devil.
Defeated White Charisma.
Defeated Snake eyes.
Defeated a Phantom 9 member.
Defeated Skull Bullet.
Defeated Garnet Dawn.
Defeated Azure Sniper.
Defeated Silent Cassiopeia.
Defeated Platinum Prince
Defeated Midnight Cinderella.
Defeated Bloodhound.
Defeated ???.
Achivement unlocked by wining an Xbox Live Race.
Achivement unlocked by wining 10 Xbox Live Races.
Achivement unlocked by wining 50 Xbox Live Races.
Achivement unlocked by wining 100 Xbox Live Races.