Clear the Green Hill Zone.
Unlocked: 09 Feb 2009 21:51:54
Get one Chaos Emerald.
Unlocked: 09 Feb 2009 21:46:34
Centurion
10Get 100 or more rings.
Unlocked: 12 Jun 2008 19:29:18
Fast Green
10Beat Green Hill Zone Act 1 in under 35 seconds.
Unlocked: Offline
Fast Marble
15Beat Marble Zone Act 1 in under 80 seconds.
Unlocked: Offline
Get to the Star Light Zone.
Unlocked: Offline
Get to the Spring Yard Zone.
Unlocked: Offline
Get to the Labyrinth Zone.
Unlocked: Offline
Chaos Master
35Get all the Chaos Emeralds.
Unlocked: Offline
Win
25Beat the game.
Unlocked: Offline
Fast Win
30Beat the game in under 40 minutes.
Unlocked: Offline
Perfect Win
40Beat the game without dying.
Unlocked: Offline