Full list of all 12 Days of Thunder Arcade achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Max out all Performance Points on a car.
Complete all the Challenges.
Use Hammer 100 times in singleplayer.
Get over 9,000 Points in Rowdy Derby Mode.
Use Focus 100 times in singleplayer.
Complete the career mode.
Compete in your first Time Trial.
Compete in your first Derby match.
Compete in your first Multiplayer Match.
Complete the Amateur Cup.
Complete the Pro Cup.
Start a new career.