Complete the following achievements to unlock Xbox Live Gamerscore points:

Achievement	How to unlock
Airball Badge (25 points)	Complete Lavaworld.
Friendball Medal (20 points)	Complete all cooperative levels.
Honor Medal (25 points)	Win 10 multiplayer races.
Marbleball Badge (10 points)	Complete Skyworld 3.
Metalball Badge (15 points)	Complete Iceworld.
Powerball Badge (15 points)	Complete Caveworld.
Speedball Medal (10 points)	Win 5 multiplayer races.
Speedroller Expert (20 points)	Collect 24 Silver Medals.
Speedroller Master (30 points)	Collect gold Medal on all levels.
Speedroller Rookie (5 points)	Collect one Silver Medal.
Speedroller Trainee (10 points)	Collect 12 Silver Medals.
Spyglass (15 points)	Find Three hidden paths.