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