Sonic The Hedgehog 2 – Platform: XBox 360

Accomplish the indicated achievement to get the corresponding number of
Gamerscore points:

Emerald Hill (5 points): Clear the Emerald Hill Zone 1.
Fast Emerald (15 points): Beat Emerald Hill Zone 1 in under 35 seconds in
single-player or co-op mode.
Fast Chemical (20 points): Beat Chemical Plant Zone 1 in under 45 seconds.
Casino (10 points): Get to the Casino Night Zone.
Super Sonic (20 points): Become Super Sonic.
Extended Super (20 points): Stay in Super Sonic mode for one minute.
Chaos Emerald (10 points): Get one Chaos Emerald.
Chaos Master (40 points): Get all the Chaos Emeralds.
Conquering Time (10 points): Beat the game in under an hour.
All Multiplayer (5 points): Play all four multiplayer zones.
Xbox Live Racer (10 points): Win 10 versus zones on Xbox Live.
Win (35 points): Complete the game.