You got 100 or more rings.
You beat the game.
You beat the game in under 40 minutes.
You beat the game without dying.
You cleared the Green Hill Zone.
You beat Green Hill Zone Act 1 in under 35 seconds.
You beat Marble Zone Act 1 in under 80 seconds.
You got to the Star Light Zone.
You got to the Spring Yard Zone.
You got to the Labyrinth Zone.
You got one Chaos Emerald.
You got all the Chaos Emeralds.