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