- Achievements
Do the following things to obtain the corresponding Gamerscore points:

10 Points
Amy Rose	Become friends with Amy.
Knuckles the Echidna	Become friends with Knuckles.
Big the Cat	Become friends with Big.
Sonic the Hedgehog	Clear the Sonic story.
Miles 'Tails' Prower	Become friends with Tails.
E-102 '?'	Become friends with E-102.
15 Points
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.
20 Points
The Fastest & Strongest	Get Level A on all the Action Stages.
Sub Game Master	Get all Emblems of the Sub Games.
Super Sonic	Clear all characters stories.
Chao's Best Friend	Get all Emblems of the Chao Race.
The Adventurer	Get all Emblems in the Adventure Field.
Mission All Accomplished	Clear all 60 missions.
40 Points
The Perfect Adventurer	Get all 130 Emblems.

- Easy rings for Black Market
After getting the Light Shoes (and Crystal Ring to speed up the process), go to the Casino area, and step on the button to make the rings appear. You can do this repeatedly for more begining rings. Notice: The ring limit can exceed 999, but you cannot tell exactly how many you have. Listen for the extra life sound to keep track of them. When you getting as many as desired, go to Emerald Coast, and complete the level without getting hit to be awarded with however many rings you have collected. Go to Chao Garden, then the Black Market, and use the rings there.

- Avatar Awards
Successfully complete the indicated task to unlock the corresponding Avatar Award:

Sonic's Hi-Speed Shoes	Accumulate ten hours of game play time.
Vintage Sonic t-shirt	Accumulate five hours of game play time.

- Metal Sonic ('DX' DLC)
Acquire 130 Emblems to unlock Metal Sonic. Select Trial mode, then choose Action Stage, and he will be a playable character. Notice: You must have the the 'DX' bonus DLC.