You beat Chemical Plant Zone 1 in under 45 seconds.
You stayed in Super Sonic mode for one minute.
You became Super Sonic.
You got all the Chaos Emeralds.
You got one Chaos Emerald.
You beat Emerald Hill Zone 1 in under 35 seconds in single-player or co-op mode.
You cleared the Emerald Hill Zone 1.
You won 10 versus zones on Xbox Live.
You played all four multiplayer zones.
You beat the game.
You got to the Casino Night Zone.
You beat the game in under an hour.