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.
Defeat the final boss and view the ending.
Clear all Acts as Super Sonic.
Clear SPLASH HILL ZONE ACT 1 in less than a minute.
Acquire all seven Chaos Emeralds.
Build up 99 or more extra lives.
Collect all the Rings in 'Special Stage 1' and Clear the stage.
Acquire a Chaos Emerald.
Defeat a boss for the first time.
Clear SPLASH HILL ZONE, ACT 1.