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13 of 49 (27%) achievements earned:

Personal Achievements
 
Unlocked Jul 4, 2017 @ 8:46am

The Opening Act

Completed the first stage.
Unlocked Oct 28, 2017 @ 5:25am

GREEN HILL Restored!

Restored the GREEH HILL stage Gate.
Unlocked Oct 29, 2017 @ 4:25am

CHEMICAL PLANT Restored!

Restored the CHEMICAL PLANT Stage Gate.
Unlocked Oct 31, 2017 @ 9:01am

SKY SANCTUARY Restored!

Restored the SKY SANCTUARY Stage Gate.
Unlocked Nov 11, 2017 @ 2:03pm

SPEED HIGHWAY Restored!

Restored the SPEED HIGHWAY Stage Gate.
Unlocked Nov 2, 2017 @ 3:56am

Sunny side up

Defeated Death Egg Robot.
Unlocked Nov 2, 2017 @ 3:40am

Scrap Metal

Defeated Metal Sonic.
Unlocked Oct 28, 2017 @ 5:14am

Bright Star

Got Rank S in an act.
Unlocked Oct 31, 2017 @ 8:55am

Shooting Star

Got Rank S in acts three times.
Unlocked Nov 2, 2017 @ 3:49am

Trickstar

Executed a trick with a seven-step combo or longer.
Unlocked Oct 29, 2017 @ 4:33am

Eradicator

Defeated 100 enemies.
Unlocked Jun 4 @ 12:09pm

Action Hero

Performed all of Sonic's actions in Act 2.
Unlocked Nov 11, 2017 @ 2:09pm

Demolition Derby

Wrecked 30 or more cars in CITY ESCAPE.



All Stages Clear!

Cleared Sonic Generations.

Greased Lightning

Cleared Green Hill within one minute.

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.

Ring King

Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.

Can't Touch This

Took no damage while defeating the final boss.

Bonds of Friendship

Completed all of Sonic's friends' Challenges.

Walkie Talkie

Chatted with all of Sonic's friends you saved.

Join the Ranks

Joined the rankings.

A 30-Second Test

Participated in a 30 Second Trial.

Jump for Joy!

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

Walk on Water

Cleared CHEMICAL PLANT without entering the water.

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.
+17

17 hidden achievements remaining

Details for each achievement will be revealed once unlocked