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.
Defeat 1,000 enemies.
Build up 99 or more extra lives.
Upload your recorded scores and clear times for all stages.
Clear all Acts as Super Sonic.
Defeat the final boss and view the ending.
Clear the E.G.G. STATION ZONE without taking any damage.
Acquire all seven Chaos Emeralds.
Acquire a Chaos Emerald.
Collect all the Rings in 'Special Stage 1' and Clear the stage.
Defeat a boss for the first time.
Clear SPLASH HILL ZONE, ACT 1.
Clear SPLASH HILL ZONE ACT 1 in less than a minute.