Here is the full list of all 30 Trollhunters: Defenders of Arcadia achievements.
Catch all Gnomes in any stage.
Collect the Horngazel and get the Treasure in a stage.
Gather all Dirty Socks in any stage.
Unlock all achievements in Trollhunters: Defenders of Arcadia.
Visit Heartstone Trollmarket.
Slay 50 Goblins.
Successfully traverse the tunnels below Arcadia.
Successfully get through the Geode Caverns.
Survive the Darklands.
Successfully complete Akiridion-5.
Successfully survive the Time-pocalypse.
Successfully reach Morgana's Castle.
Reach the end and reset the Timeline.
Gather every Dirty Sock in the game.
Defeat every Boss in the game.
Catch every Gnome in the game.
Catch Luug in Trollmarket.
Complete a game of Go-Go Sushi.
Hit every target without losing a gnome in Omelrug's Gnome Challenge.
Purchase an item from Bagdwella in Trollmarket.
Purchase any Armor Upgrade from Vendel.
Purchase all Armor Upgrades from Vendel.
Have an Assist deliver a powerful smash!
Reach new heights with an Assist!
Take a ride on an Akiridion Hoverboard.
Call for a healing Assist!
Upgrade any Assist.
Complete the game in Human (Normal) Mode.
Complete the game in Troll (Hard) Mode.
Complete 3 side quests in the game.