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31 of 49 (63%) achievements earned:

Personal Achievements
 
Unlocked Aug 1, 2012 @ 1:59am

The Opening Act

Completed the first stage.
Unlocked Aug 1, 2012 @ 2:10am

GREEN HILL Restored!

Restored the GREEH HILL stage Gate.
Unlocked Aug 1, 2012 @ 2:14am

CHEMICAL PLANT Restored!

Restored the CHEMICAL PLANT Stage Gate.
Unlocked Aug 1, 2012 @ 2:29am

SKY SANCTUARY Restored!

Restored the SKY SANCTUARY Stage Gate.
Unlocked Aug 19, 2012 @ 1:30am

SPEED HIGHWAY Restored!

Restored the SPEED HIGHWAY Stage Gate.
Unlocked Aug 19, 2012 @ 1:41am

CITY ESCAPE Restored!

Restored the CITY ESCAPE Stage Gate.
Unlocked Aug 19, 2012 @ 1:54am

SEASIDE HILL Restored!

Restored the SEASIDE HILL Stage Gate.
Unlocked Aug 20, 2012 @ 2:58am

CRISIS CITY Restored!

Restored the CRISIS CITY Stage Gate.
Unlocked Aug 20, 2012 @ 6:35am

ROOFTOP RUN Restored!

Restored the ROOFTOP RUN Stage Gate.
Unlocked Aug 20, 2012 @ 6:55am

PLANET WISP Restored!

Restored the PLANET WISP Stage Gate.
Unlocked Aug 19, 2012 @ 1:19am

Sunny side up

Defeated Death Egg Robot.
Unlocked Aug 20, 2012 @ 2:38am

Perfect Punisher

Defeated Perfect Chaos.
Unlocked Aug 20, 2012 @ 7:25am

Boom Boom Dragoon

Defeated Egg Dragoon.
Unlocked Aug 3, 2012 @ 7:08am

Scrap Metal

Defeated Metal Sonic.
Unlocked Aug 20, 2012 @ 2:26am

Shadow Boxing

Defeated Shadow.
Unlocked Aug 20, 2012 @ 7:00am

Silver Got Served

Defeated Silver.
Unlocked Aug 20, 2012 @ 7:26am

Treasure Hunter

Collected all the Chaos Emeralds.
Unlocked Aug 20, 2012 @ 7:49am

All Stages Clear!

Cleared Sonic Generations.
Unlocked Mar 22, 2013 @ 2:32pm

Greased Lightning

Cleared Green Hill within one minute.
Unlocked Aug 1, 2012 @ 1:59am

Bright Star

Got Rank S in an act.
Unlocked Aug 1, 2012 @ 2:10am

Shooting Star

Got Rank S in acts three times.
Unlocked Aug 20, 2012 @ 2:31am

Trickstar

Executed a trick with a seven-step combo or longer.
Unlocked Aug 1, 2012 @ 2:29am

Eradicator

Defeated 100 enemies.
Unlocked Aug 1, 2012 @ 1:58am

Ring King

Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Unlocked Aug 19, 2012 @ 1:28am

Action Hero

Performed all of Sonic's actions in Act 2.
Unlocked Aug 22, 2012 @ 11:04am

Walkie Talkie

Chatted with all of Sonic's friends you saved.
Unlocked Aug 20, 2012 @ 3:05am

Join the Ranks

Joined the rankings.
Unlocked Aug 21, 2012 @ 1:45am

A 30-Second Test

Participated in a 30 Second Trial.
Unlocked Mar 22, 2013 @ 2:42pm

Walk on Water

Cleared CHEMICAL PLANT without entering the water.
Unlocked Aug 19, 2012 @ 1:35am

Demolition Derby

Wrecked 30 or more cars in CITY ESCAPE.
Unlocked Aug 21, 2012 @ 1:50am

Supersonic!

Cleared a regular stage as Super Sonic.



Blazing Meteor

Got Rank S in acts seven times.

Blue Comet

Got Rank S in acts 12 times.

Big Bang

Got Rank S in all acts.

Can't Touch This

Took no damage while defeating the final boss.

Bonds of Friendship

Completed all of Sonic's friends' Challenges.

Jump for Joy!

Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.

Mad Skillz

Got all custom skills.

(Hedge)Hogging It All Up!

Got all collectibles.

Time Attacker

Played Time Attack on all stages.

Red Ring Collector

Got all Red Star Rings.

Halfway Point

Cleared half the missions.

Mission Accomplished!

Cleared all the missions.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked