Unlockables
| Unlockable | How to Unlock |
|---|---|
| Light-Speed Shoes | Unlock the light-speed shoes in-game, then upon loading the savefile after booting the game a second time it will unlock in Playstation Home. |
| Sonic Adventure T-Shirt | Load a savedata where you have cleared all characters stories to unlock the item |
Unlockable Characters
| Unlockable | How to Unlock |
|---|---|
| Amy | Talk to her in the Casino as Sonic after finishing Sky Chase. |
| Big | Defeat Chaos 6 as Sonic. |
| E-102 Gamma | Defeat Gamma after finishing Sky Deck as Sonic or Tails. An alternate way to unlock him is to finish Twinkle Park as Amy and watch the FMAs after it. |
| Knuckles | Defeat him after finishing Ice cap as Sonic or Tails. |
| Miles Tails Prower | Finish the C mission of Emerald Coast action stage as Sonic. |
| Super Sonic | Finish the game as Sonic, Tails, Knuckles, Amy, Big and E-102 Gamma. Super Sonic will be avaliable only in Adventure Mode. |
| Metal Sonic | Collect all 130 emblems. Go to trial mode and pick "action stage". He will then be a playable character. REQUIRES SONIC ADVENTURE DX ADDON. |
Upgrades
| Unlockable | How to Unlock |
|---|---|
| Ancient Light (Sonic) | On top of a rock on Angel Island |
| Booster (E-102) | In the Weapon's Armory on the Egg Carrier |
| Crystal Ring (Sonic) | Walk up the steps in the hotel, press the two buttons and use light speed dash |
| Fighting Gloves (Knuckles) | On a ledge over Big's house |
| Jet Anklet (Tails) | In a hole in the ceiling in the sewer behind Twinkle Park |
| Laser Blaster (E-102) | In the Restricted room on the Egg Carrier after it crashes |
| Life Belt (Big) | In the entrance to Icecap |
| Light Speed Shoes (Sonic) | Find it in the sewer (not the onebehind Twinkle Park) |
| Long Hammer (Amy) | Beat your own high score on Hedgehog Hammer after the Egg Carrier crashes |
| Long Rod (Big) | Under the bed at Big's hut |
| Lure Upgrade 1 (Big) | In the sewer behind Twinkle Park |
| Lure Upgrade 2 (Big) | Under an sheet of ice in IceCap |
| Lure Upgrade 3 (Big) | In a cave in the forest |
| Lure Upgrade 4 (Big) | In one of the jail cells on the Egg Carrier |
| Rhythm Badge (Tails) | In the flashback with Tikal |
| Shovel Claw (Knuckles) | In the tunnel inside the tunnel where you find the cart to the Mystic Ruins Chao Garden |
| Warrior Feather (Amy) | Beat Eggman's high-score on Hedgehog Hammer |
Easter Eggs
While playing with Sonic in Casinopolis, go to the pinball game with the NiGHTS motif. Hit the three little purple point givers in order to open up an entrance at the top. Make your way through and you'll now be in another NiGHTS motif pinball game. Whenever you fail to catch Sonic with the bumpers, don't worry. Sonic will be transported through a world very familiar to the NiGHTS level Splash Garden.
Sonic Adventure DX DLC Trophies
There is 1 Bronze Trophy, 1 Silver Trophy, and 1 Gold Trophy.
| Trophy | Description |
|---|---|
| Metal Sonic (Bronze) | Get all 130 Emblems by playing Sonic Adventure DX. |
| Metal Sonic Master (Silver) | Get Level A on all the Action Stages by using Metal Sonic. |
| Mission All Accomplished (Gold) | Clear all 60 missions. |
Trophies
There are 7 Bronze Trophies, 4 Silver Trophies, and 1 Gold Trophy.
| Trophy | Description |
|---|---|
| Amy Rose (Bronze) | Become friends with Amy. |
| Big the Cat (Bronze) | Become friends with Big. |
| Chao's Best Friend (Silver) | Get all Emblems of the Chao Race. |
| E-102 'y' (Bronze) | Become friends with E-102. |
| Knuckles the Echidna (Bronze) | Become friends with Knuckles. |
| Miles 'Tails' Prower (Bronze) | Become friends with Tails. |
| Sonic the Hedgehog (Bronze) | Clear the Sonic story. |
| Sub Game Master (Silver) | Get all Emblems of the Sub Games. |
| Super Sonic (Bronze) | Clear all characters stories. |
| The Adventurer (Silver) | Get all Emblems in the Adventure Field. |
| The Fastest & Strongest (Silver) | Get Level A on all the Action Stages. |
| The Perfect Adventurer (Gold) | Get 130 Emblems. |
