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.
Complete Lavaworld
Three hidden paths found
12 Silver medals Collected
One Silver medal Collected
Caveworld complete
Iceworld Complete
Skyworld 3 completed
Collect 24 Silver Medals
Collect gold Medal on all levels
Win 5 multiplayer races
Win 10 multiplayer races
Complete all cooperative levels