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8 of 15 (53%) achievements earned:

Personal Achievements

Miles "Tails" Prower

Become friends with Tails.
Unlocked Jan 24, 2015 @ 5:25pm

Knuckles the Echidna

Become friends with Knuckles.
Unlocked Mar 1, 2015 @ 10:31am

Amy Rose

Become friends with Amy.
Unlocked Mar 1, 2015 @ 10:49am

E-102 "γ"

Become friends with E-102.
Unlocked Jul 1, 2015 @ 9:44am

Big the Cat

Become friends with Big.
Unlocked Dec 23, 2016 @ 8:38pm

Sonic the Hedgehog

Clear the Sonic story.
Unlocked Jul 1, 2015 @ 10:15am

Super Sonic

Clear all characters stories.
Unlocked Aug 7, 2016 @ 10:51pm

The Adventurer

Get all Emblems in the Adventure Field.
Unlocked Apr 7, 2017 @ 12:11pm

The Fastest & Strongest

Get Level A on all the Action Stages.

Sub Game Master

Get all Emblems of the Sub Games.

Chao's Best Friend

Get all Emblems of the Chao Race.

The Perfect Adventurer

Get all 130 Emblems.

Metal Sonic

Get all 130 Emblems by playing Sonic Adventure DX.

Metal Sonic Master

Get Level A on all the Action Stages by using Metal Sonic.

Mission All Accomplished

Clear all 60 missions.