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.
Clear SPLASH HILL ZONE ACT 1 in less than a minute.
Acquire all seven Chaos Emeralds.
Clear the E.G.G. STATION ZONE without taking any damage.
Defeat the final boss and view the ending.
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.