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