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49 of 49 (100%) achievements earned:

Personal Achievements
 
Unlocked Nov 3, 2011 @ 5:12pm

The Opening Act

Completed the first stage.
Unlocked Nov 3, 2011 @ 5:20pm

GREEN HILL Restored!

Restored the GREEH HILL stage Gate.
Unlocked Nov 3, 2011 @ 5:37pm

CHEMICAL PLANT Restored!

Restored the CHEMICAL PLANT Stage Gate.
Unlocked Nov 3, 2011 @ 5:49pm

SKY SANCTUARY Restored!

Restored the SKY SANCTUARY Stage Gate.
Unlocked Nov 4, 2011 @ 5:09am

SPEED HIGHWAY Restored!

Restored the SPEED HIGHWAY Stage Gate.
Unlocked Nov 4, 2011 @ 5:20am

CITY ESCAPE Restored!

Restored the CITY ESCAPE Stage Gate.
Unlocked Nov 4, 2011 @ 5:32am

SEASIDE HILL Restored!

Restored the SEASIDE HILL Stage Gate.
Unlocked Nov 4, 2011 @ 7:10am

CRISIS CITY Restored!

Restored the CRISIS CITY Stage Gate.
Unlocked Nov 4, 2011 @ 7:20am

ROOFTOP RUN Restored!

Restored the ROOFTOP RUN Stage Gate.
Unlocked Nov 4, 2011 @ 7:51am

PLANET WISP Restored!

Restored the PLANET WISP Stage Gate.
Unlocked Nov 4, 2011 @ 4:58am

Sunny side up

Defeated Death Egg Robot.
Unlocked Nov 4, 2011 @ 5:46am

Perfect Punisher

Defeated Perfect Chaos.
Unlocked Nov 4, 2011 @ 8:28am

Boom Boom Dragoon

Defeated Egg Dragoon.
Unlocked Nov 3, 2011 @ 5:52pm

Scrap Metal

Defeated Metal Sonic.
Unlocked Nov 4, 2011 @ 5:35am

Shadow Boxing

Defeated Shadow.
Unlocked Nov 4, 2011 @ 8:07am

Silver Got Served

Defeated Silver.
Unlocked Nov 4, 2011 @ 8:29am

Treasure Hunter

Collected all the Chaos Emeralds.
Unlocked Nov 4, 2011 @ 9:18am

All Stages Clear!

Cleared Sonic Generations.
Unlocked Nov 9, 2011 @ 12:34pm

Greased Lightning

Cleared Green Hill within one minute.
Unlocked Nov 3, 2011 @ 5:13pm

Bright Star

Got Rank S in an act.
Unlocked Nov 3, 2011 @ 5:30pm

Shooting Star

Got Rank S in acts three times.
Unlocked Nov 4, 2011 @ 5:08am

Blazing Meteor

Got Rank S in acts seven times.
Unlocked Nov 4, 2011 @ 7:09am

Blue Comet

Got Rank S in acts 12 times.
Unlocked Nov 12, 2011 @ 10:48am

Big Bang

Got Rank S in all acts.
Unlocked Nov 4, 2011 @ 7:12am

Trickstar

Executed a trick with a seven-step combo or longer.
Unlocked Nov 3, 2011 @ 5:48pm

Eradicator

Defeated 100 enemies.
Unlocked Nov 3, 2011 @ 5:12pm

Ring King

Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Unlocked Nov 4, 2011 @ 5:21am

Action Hero

Performed all of Sonic's actions in Act 2.
Unlocked Dec 5, 2011 @ 4:53am

Can't Touch This

Took no damage while defeating the final boss.
Unlocked Dec 5, 2011 @ 4:53am

Bonds of Friendship

Completed all of Sonic's friends' Challenges.
Unlocked Nov 9, 2011 @ 4:27am

Walkie Talkie

Chatted with all of Sonic's friends you saved.
Unlocked Nov 8, 2011 @ 10:09am

Join the Ranks

Joined the rankings.
Unlocked Nov 12, 2011 @ 9:27am

A 30-Second Test

Participated in a 30 Second Trial.
Unlocked Nov 9, 2011 @ 7:52am

Jump for Joy!

Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.
Unlocked Nov 4, 2011 @ 2:40pm

Walk on Water

Cleared CHEMICAL PLANT without entering the water.
Unlocked Nov 3, 2011 @ 5:48pm

Walk on Air

Cleared SKY SANCTUARY without falling even once.
Unlocked Nov 26, 2011 @ 6:45am

The Byway or the Highway

Got the Red Star Ring located on the shortcut route in SPEED HIGHWAY.
Unlocked Nov 4, 2011 @ 5:14am

Demolition Derby

Wrecked 30 or more cars in CITY ESCAPE.
Unlocked Dec 5, 2011 @ 4:53am

Secret Sleuth

Got the Red Star Ring located in the hidden room in SEASIDE HILL.
Unlocked Dec 5, 2011 @ 11:24am

Look Both Ways

Reached the goal in CRISIS CITY without being hit by a tornado-carried car.
Unlocked Nov 9, 2011 @ 5:23am

A Quick Breather

Got the Red Star Ring atop the highest spot in ROOFTOP RUN.
Unlocked Dec 5, 2011 @ 4:53am

Color Power!

Got the Red Star Ring by using an Orange Wisp in PLANET WISP.
Unlocked Nov 9, 2011 @ 7:59am

Supersonic!

Cleared a regular stage as Super Sonic.
Unlocked Dec 5, 2011 @ 4:53am

Mad Skillz

Got all custom skills.
Unlocked Dec 5, 2011 @ 4:53am

(Hedge)Hogging It All Up!

Got all collectibles.
Unlocked Oct 12, 2015 @ 5:03am

Time Attacker

Played Time Attack on all stages.
Unlocked Dec 5, 2011 @ 4:53am

Red Ring Collector

Got all Red Star Rings.
Unlocked Nov 8, 2011 @ 3:49pm

Halfway Point

Cleared half the missions.
Unlocked Dec 5, 2011 @ 4:53am

Mission Accomplished!

Cleared all the missions.