CheatCodes.com has the complete list of all Sonic the Hedgehog Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Sonic the Hedgehog as of Monday July 6, 2015 are shown below, or you can print out our Printable Achievements Checklist that shows all Sonic the Hedgehog Achievements and Gamerscores in a simple quick-reference format.
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 Gold Medals…
Super Sonic 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 swiftly.
Meet all the requests with magnificent skill.
Reveal all the secrets with your ultimate power.