Here is the full list of all 38 Skylanders: Spyro's Adventure trophies - there are 21 bronze, 12 silver, 4 gold and 1 platinum.
Unlock all other trophies.
Avoid being hit by the laser traps during the boss fight in the Creepy Citadel level.
Destroy all of the rocks in the Molekin Mine level.
Never use any rocket in the Falling Forest level.
In the Falling Forest level, defeat Evil Ent while more than 5 of Evil Ent's seeds are on the field.
Get 3 stars in any one level.
Collect 10 Hats.
Defeat Kaos' Evil minions in the Lava Lakes Railway level with only Gill Grunt's Power Hose.
Defeat Kaos without swapping Skylanders during the battle.
Complete the adventure mode by finishing the game.
Complete the Arkeyan Armory level and acquire the elemental source.
Defeat 30 enemies while riding the War Machine in the Arkeyan Armory level.
Complete the Lava Lakes Railway level and acquire the elemental source.
Complete the Creepy Citadel level and acquire the elemental source.
Purchase all upgrades for any one Skylander.
Collect 10 Legendary Treasures.
Complete the Battlefield level and acquire the elemental source.
Level up any one Skylander to level 10.
Complete the Troll Warehouse level without getting injured by the landmines.
Complete the Falling Forest level and acquire the elemental source.
Collect 10 Story Scrolls.
Complete 3 Challenge levels.
Collect 10 Soul Gems.
Complete the Stone Town level and acquire the elemental source.
Complete the Crystal Eye Castle level without being hit by any of the rolling barrels.
Complete the Leviathan Lagoon level and acquire the elemental source.
In the Leviathan Lagoon level, dodge 30 sharks without being hit.
Get swallowed by the Leviathan 5 times in the Leviathan Lagoon level.
Play and complete any PvP match: win or lose.
Complete the Stormy Stronghold level and acquire the elemental source.
The first time you purchase an upgrade for your Skylander.
Complete your first challenge level!
Have your Skylander equip a hat for the first time.
Complete the Shattered Island level.
Unlock any Elemental Gate.
Defeat 15 Chompies in the Shattered Island level.
Open any treasure chest.
The first time you put your Skylander on the Portal of Power.