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49 of 49 (100%) achievements earned:
Personal Achievements
 

The Opening Act

Completed the first stage.
Unlocked 22 Jan, 2012 @ 12:58am

GREEN HILL Restored!

Restored the GREEH HILL stage Gate.
Unlocked 22 Jan, 2012 @ 1:05am

CHEMICAL PLANT Restored!

Restored the CHEMICAL PLANT Stage Gate.
Unlocked 22 Jan, 2012 @ 1:31am

SKY SANCTUARY Restored!

Restored the SKY SANCTUARY Stage Gate.
Unlocked 24 Jan, 2012 @ 4:05am

SPEED HIGHWAY Restored!

Restored the SPEED HIGHWAY Stage Gate.
Unlocked 21 Jul, 2012 @ 6:53am

CITY ESCAPE Restored!

Restored the CITY ESCAPE Stage Gate.
Unlocked 21 Jul, 2012 @ 6:58am

SEASIDE HILL Restored!

Restored the SEASIDE HILL Stage Gate.
Unlocked 21 Jul, 2012 @ 7:16am

CRISIS CITY Restored!

Restored the CRISIS CITY Stage Gate.
Unlocked 22 Jul, 2012 @ 4:46am

ROOFTOP RUN Restored!

Restored the ROOFTOP RUN Stage Gate.
Unlocked 22 Jul, 2012 @ 4:59am

PLANET WISP Restored!

Restored the PLANET WISP Stage Gate.
Unlocked 22 Jul, 2012 @ 5:20am

Sunny side up

Defeated Death Egg Robot.
Unlocked 21 Jul, 2012 @ 6:36am

Perfect Punisher

Defeated Perfect Chaos.
Unlocked 22 Jul, 2012 @ 2:59am

Boom Boom Dragoon

Defeated Egg Dragoon.
Unlocked 4 Aug, 2012 @ 7:37pm

Scrap Metal

Defeated Metal Sonic.
Unlocked 21 Jul, 2012 @ 3:37am

Shadow Boxing

Defeated Shadow.
Unlocked 21 Jul, 2012 @ 7:27am

Silver Got Served

Defeated Silver.
Unlocked 23 Jul, 2012 @ 7:20am

Treasure Hunter

Collected all the Chaos Emeralds.
Unlocked 4 Aug, 2012 @ 7:38pm

All Stages Clear!

Cleared Sonic Generations.
Unlocked 4 Aug, 2012 @ 8:00pm

Greased Lightning

Cleared Green Hill within one minute.
Unlocked 20 Apr, 2013 @ 10:05am

Bright Star

Got Rank S in an act.
Unlocked 22 Jan, 2012 @ 1:01am

Shooting Star

Got Rank S in acts three times.
Unlocked 22 Jan, 2012 @ 1:16am

Blazing Meteor

Got Rank S in acts seven times.
Unlocked 22 Jul, 2012 @ 2:47am

Blue Comet

Got Rank S in acts 12 times.
Unlocked 24 Jul, 2012 @ 6:33am

Big Bang

Got Rank S in all acts.
Unlocked 4 Aug, 2012 @ 6:34pm

Trickstar

Executed a trick with a seven-step combo or longer.
Unlocked 22 Jan, 2012 @ 1:01am

Eradicator

Defeated 100 enemies.
Unlocked 24 Jan, 2012 @ 4:04am

Ring King

Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Unlocked 23 Jul, 2012 @ 10:27pm

Action Hero

Performed all of Sonic's actions in Act 2.
Unlocked 21 Jul, 2012 @ 7:10am

Can't Touch This

Took no damage while defeating the final boss.
Unlocked 24 Jul, 2013 @ 10:39am

Bonds of Friendship

Completed all of Sonic's friends' Challenges.
Unlocked 4 Aug, 2012 @ 7:30pm

Walkie Talkie

Chatted with all of Sonic's friends you saved.
Unlocked 4 Aug, 2012 @ 10:33am

Join the Ranks

Joined the rankings.
Unlocked 4 Aug, 2012 @ 8:14pm

A 30-Second Test

Participated in a 30 Second Trial.
Unlocked 28 Jul, 2013 @ 8:24am

Jump for Joy!

Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.
Unlocked 23 Jul, 2012 @ 10:32pm

Walk on Water

Cleared CHEMICAL PLANT without entering the water.
Unlocked 20 Apr, 2013 @ 10:05am

Walk on Air

Cleared SKY SANCTUARY without falling even once.
Unlocked 2 Jun, 2012 @ 10:31pm

The Byway or the Highway

Got the Red Star Ring located on the shortcut route in SPEED HIGHWAY.
Unlocked 24 Jul, 2012 @ 6:25am

Demolition Derby

Wrecked 30 or more cars in CITY ESCAPE.
Unlocked 22 Jul, 2012 @ 2:47am

Secret Sleuth

Got the Red Star Ring located in the hidden room in SEASIDE HILL.
Unlocked 24 Jul, 2012 @ 6:38am

Look Both Ways

Reached the goal in CRISIS CITY without being hit by a tornado-carried car.
Unlocked 27 Jul, 2012 @ 8:49pm

A Quick Breather

Got the Red Star Ring atop the highest spot in ROOFTOP RUN.
Unlocked 26 Jul, 2012 @ 6:23am

Color Power!

Got the Red Star Ring by using an Orange Wisp in PLANET WISP.
Unlocked 4 Aug, 2012 @ 6:27pm

Supersonic!

Cleared a regular stage as Super Sonic.
Unlocked 20 Apr, 2013 @ 10:05am

Mad Skillz

Got all custom skills.
Unlocked 4 Aug, 2012 @ 8:01pm

(Hedge)Hogging It All Up!

Got all collectibles.
Unlocked 4 Aug, 2012 @ 8:00pm

Time Attacker

Played Time Attack on all stages.
Unlocked 28 Jul, 2013 @ 8:24am

Red Ring Collector

Got all Red Star Rings.
Unlocked 4 Aug, 2012 @ 6:48pm

Halfway Point

Cleared half the missions.
Unlocked 22 Jul, 2012 @ 2:17am

Mission Accomplished!

Cleared all the missions.
Unlocked 4 Aug, 2012 @ 7:30pm