Here is the full list of all 16 Sonic The Hedgehog 4: Episode I achievements worth 200 gamerscore.
Clear the E.G.G. Station Zone without taking any damage.
Upload your recorded clear times for all Time Attack stages.
Clear all Acts as Super Sonic.
Acquire all seven Chaos Emeralds.
Defeat 1,000 enemies.
Defeat the final boss and view the ending.
Finish all 3 Acts and boss round of Mad Gear Zone
Get 120 rings in Mad Gear Zone Act 1.
Build up 99 or more extra lives.
Collect all the Rings in 'Special Stage 1' and Clear the stage.
Finish all 3 Acts and boss round of Lost Labrinth Zone
Clear Splash Hill Zone Act 1 in less than a minute.
Acquire a Chaos Emerald.
Finish all 3 Acts and boss round of Casino Street Zone
Finish all 3 Acts and boss round of Splash Hill Zone
Clear Splash Hill Zone Act 1.