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