Full list of all 12 Sonic the Hedgehog 4 - Episode I achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Clear the E.G.G. STATION ZONE without taking any damage.
Clear SPLASH HILL ZONE ACT 1 in less than a minute.
Defeat 1,000 enemies.
Upload your recorded scores and clear times for all stages.
Clear all Acts as Super Sonic.
Collect all the Rings in 'Special Stage 1' and Clear the stage.
Defeat the final boss and view the ending.
Acquire all seven Chaos Emeralds.
Build up 99 or more extra lives.
Defeat a boss for the first time.
Acquire a Chaos Emerald.
Clear SPLASH HILL ZONE, ACT 1.