Full list of all 12 Switchball achievements worth 200 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
10 multiplayer races won
5 multiplayer races won
Collect gold Medal on all levels
Complete Lavaworld
Collect 24 Silver Medals
Caveworld complete
Iceworld Complete
12 Silver medals Collected
Three hidden paths found
Skyworld 3 completed
All Cooperative levels complete
One Silver medal Collected