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

The Opening Act

Completed the first stage.
Unlocked 9 Nov, 2011 @ 5:34am

GREEN HILL Restored!

Restored the GREEH HILL stage Gate.
Unlocked 9 Nov, 2011 @ 5:52am

CHEMICAL PLANT Restored!

Restored the CHEMICAL PLANT Stage Gate.
Unlocked 9 Nov, 2011 @ 6:12am

SKY SANCTUARY Restored!

Restored the SKY SANCTUARY Stage Gate.
Unlocked 9 Nov, 2011 @ 6:24am

SPEED HIGHWAY Restored!

Restored the SPEED HIGHWAY Stage Gate.
Unlocked 12 Nov, 2011 @ 10:03am

CITY ESCAPE Restored!

Restored the CITY ESCAPE Stage Gate.
Unlocked 12 Nov, 2011 @ 10:30am

SEASIDE HILL Restored!

Restored the SEASIDE HILL Stage Gate.
Unlocked 12 Nov, 2011 @ 11:46am

CRISIS CITY Restored!

Restored the CRISIS CITY Stage Gate.
Unlocked 13 Nov, 2011 @ 12:24pm

ROOFTOP RUN Restored!

Restored the ROOFTOP RUN Stage Gate.
Unlocked 13 Nov, 2011 @ 12:36pm

PLANET WISP Restored!

Restored the PLANET WISP Stage Gate.
Unlocked 14 Nov, 2011 @ 2:54am

Sunny side up

Defeated Death Egg Robot.
Unlocked 10 Nov, 2011 @ 12:02am

Perfect Punisher

Defeated Perfect Chaos.
Unlocked 12 Nov, 2011 @ 12:06pm

Boom Boom Dragoon

Defeated Egg Dragoon.
Unlocked 16 Nov, 2011 @ 9:54pm

Scrap Metal

Defeated Metal Sonic.
Unlocked 9 Nov, 2011 @ 7:49am

Shadow Boxing

Defeated Shadow.
Unlocked 13 Nov, 2011 @ 4:09am

Silver Got Served

Defeated Silver.
Unlocked 15 Nov, 2011 @ 2:12am

Treasure Hunter

Collected all the Chaos Emeralds.
Unlocked 16 Nov, 2011 @ 9:56pm

All Stages Clear!

Cleared Sonic Generations.
Unlocked 16 Nov, 2011 @ 10:49pm

Greased Lightning

Cleared Green Hill within one minute.
Unlocked 13 Nov, 2011 @ 2:37am

Bright Star

Got Rank S in an act.
Unlocked 9 Nov, 2011 @ 5:55am

Shooting Star

Got Rank S in acts three times.
Unlocked 9 Nov, 2011 @ 6:10am

Blazing Meteor

Got Rank S in acts seven times.
Unlocked 12 Nov, 2011 @ 3:30am

Blue Comet

Got Rank S in acts 12 times.
Unlocked 13 Nov, 2011 @ 6:29am

Big Bang

Got Rank S in all acts.
Unlocked 15 Nov, 2011 @ 9:38am

Trickstar

Executed a trick with a seven-step combo or longer.
Unlocked 11 Nov, 2011 @ 11:42pm

Eradicator

Defeated 100 enemies.
Unlocked 9 Nov, 2011 @ 6:17am

Ring King

Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Unlocked 11 Nov, 2011 @ 11:46pm

Action Hero

Performed all of Sonic's actions in Act 2.
Unlocked 12 Nov, 2011 @ 5:24am

Can't Touch This

Took no damage while defeating the final boss.
Unlocked 4 Feb, 2016 @ 1:54am

Bonds of Friendship

Completed all of Sonic's friends' Challenges.
Unlocked 17 Nov, 2011 @ 2:12am

Walkie Talkie

Chatted with all of Sonic's friends you saved.
Unlocked 14 Nov, 2011 @ 2:54am

Join the Ranks

Joined the rankings.
Unlocked 16 Nov, 2011 @ 11:46pm

A 30-Second Test

Participated in a 30 Second Trial.
Unlocked 17 Nov, 2011 @ 12:28am

Jump for Joy!

Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.
Unlocked 11 Nov, 2011 @ 11:39pm

Walk on Water

Cleared CHEMICAL PLANT without entering the water.
Unlocked 17 Nov, 2011 @ 9:58pm

Walk on Air

Cleared SKY SANCTUARY without falling even once.
Unlocked 12 Nov, 2011 @ 3:25am

The Byway or the Highway

Got the Red Star Ring located on the shortcut route in SPEED HIGHWAY.
Unlocked 13 Nov, 2011 @ 2:16am

Demolition Derby

Wrecked 30 or more cars in CITY ESCAPE.
Unlocked 10 Nov, 2011 @ 1:37am

Secret Sleuth

Got the Red Star Ring located in the hidden room in SEASIDE HILL.
Unlocked 13 Nov, 2011 @ 5:06am

Look Both Ways

Reached the goal in CRISIS CITY without being hit by a tornado-carried car.
Unlocked 20 Nov, 2011 @ 2:48am

A Quick Breather

Got the Red Star Ring atop the highest spot in ROOFTOP RUN.
Unlocked 15 Nov, 2011 @ 6:06am

Color Power!

Got the Red Star Ring by using an Orange Wisp in PLANET WISP.
Unlocked 15 Nov, 2011 @ 9:09am

Supersonic!

Cleared a regular stage as Super Sonic.
Unlocked 20 Nov, 2011 @ 2:40am

Mad Skillz

Got all custom skills.
Unlocked 17 Nov, 2011 @ 2:05am

(Hedge)Hogging It All Up!

Got all collectibles.
Unlocked 17 Nov, 2011 @ 2:26am

Time Attacker

Played Time Attack on all stages.
Unlocked 20 Nov, 2011 @ 8:30pm

Red Ring Collector

Got all Red Star Rings.
Unlocked 17 Nov, 2011 @ 2:05am

Halfway Point

Cleared half the missions.
Unlocked 13 Nov, 2011 @ 3:46am

Mission Accomplished!

Cleared all the missions.
Unlocked 17 Nov, 2011 @ 2:12am