There are 12 achievements worth a total of 200 points
You cleared Emerald Hill Zone 1
You beat Emerald Hill Zone in under 35 seconds in single player or co-op mode
You played all four multiplayer zones
Win 10 versus zones on Xbox live
Get one Chaos Emerald
Beat Chemical Plant Zone 1 in under 45 seconds
Get all the Chaos Emeralds
Become Super Sonic
Stay in Super Sonic mode for a minute
You got to the Casino Night Zone
Beat the game
Beat the game in under an hour