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.
Complete all the Challenges.
Get over 9,000 Points in Rowdy Derby Mode.
Compete in your first Derby match.
Complete the career mode.
Max out all Performance Points on a car.
Complete the Pro Cup.
Use Focus 100 times in singleplayer.
Complete the Amateur Cup.
Use Hammer 100 times in singleplayer.
Compete in your first Multiplayer Match.
Start a new career.
Compete in your first Time Trial.