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6 of 15 (40%) achievements earned:

Personal Achievements
Unlocked Sep 2 @ 2:14am

Miles "Tails" Prower

Become friends with Tails.
Unlocked Sep 2 @ 3:05am

Knuckles the Echidna

Become friends with Knuckles.
Unlocked Sep 2 @ 3:14am

Amy Rose

Become friends with Amy.
Unlocked Sep 2 @ 4:53am

E-102 "γ"

Become friends with E-102.
Unlocked Sep 2 @ 5:01am

Big the Cat

Become friends with Big.
Unlocked Sep 15 @ 5:24am

Sonic the Hedgehog

Clear the Sonic story.

Super Sonic

Clear all characters stories.

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 Adventurer

Get all Emblems in the Adventure Field.

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.