Full list of all 23 Sonic The Hedgehog achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox 360.
Clear Sonic Episode!
Clear Shadow Episode!
Clear Silver Episode!
End the last hidden story.
Clear unlocked Sonic difficult level mission.
Clear unlocked Shadow difficult level mission.
Clear unlocked Silver difficult level mission.
Clear all unlocked Shadow ACT Missions with Rank S.
Clear all unlocked Sonic ACT Missions with Rank S.
Clear all unlocked Silver ACT Missions with Rank S.
Unlock the complete ending to
the last hidden story.
Overcome all trials and
accomplish a great feat.
When you collect all the Silver Medals
scattered around Soleanna…
When you collect all the Soleanna legendary
Obtain the all moves.
Resurrect the ultimate power from the lost memory
Obtain all the power to save the future world
Solve all Soleannans' problems
Complete all the tasks given as agent
Solve all the mystery in Soleanna
Solve all the problems
Meet all the requests
with magnificent skill.
Reveal all the secrets
with your ultimate power.