Here is the full list of all 12 Sonic The Hedgehog 4: Episode I achievements worth 200 gamerscore.
Upload your recorded scores and clear times for all stages.
Clear all Acts as Super Sonic.
Defeat 1,000 enemies.
Acquire all seven Chaos Emeralds.
Clear the E.G.G. STATION ZONE without taking any damage.
Defeat the final boss and view the ending.
Collect all the Rings in 'Special Stage 1' and Clear the stage.
Build up 99 or more extra lives.
Clear SPLASH HILL ZONE ACT 1 in less than a minute.
Acquire a Chaos Emerald.
Defeat a boss for the first time.
Clear SPLASH HILL ZONE, ACT 1.