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