There are 12 achievements worth a total of 200 points
Get all the Chaos Emeralds.
You beat the game without dying.
You beat the game.
You got to the Star Light Zone.
You got to the Labyrinth Zone.
You got to the Spring Yard Zone.
Beat Marble Zone Act 1 in under 80 seconds.
You got one Chaos Emerald.
You got 100 or more rings.
You cleared the Green Hill Zone.
You beat Green Hill Zone Act 1 in under 35 seconds.
Beat the game in under 40 minutes.