Here is the full list of all 33 Trine Enchanted Edition achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
In a single level, kill one monster by jumping on it with the Knight, one with the Wizard's abilities and one with the Thief's grappling hook kick
Find all secret items in every level
Complete at least 5 jumps (or 3 in Enchanted Edition) in a row on different skeletons without touching the ground
Collect all experience in the game
Collect all experience in Tower of Sarek
Collect all experience in Iron Forge
Collect all experience in Heartland Mines
Complete the entire game
Collect all experience in Bramblestoke Village
Collect all experience in Ruins of the Perished
Collect all experience in Shadowthorn Thicket
Collect all experience in Fangle Forest
Collect all experience in Throne of the Lost
Collect all experience in Forsaken Dungeons
Complete a level with 25 or more character deaths
Collect all experience in Crypt of the Damned
Collect all experience in Crystal Caverns
Find the Academic, Bony and Crystalline holiday secret gifts.
Stay underwater for more than 20 seconds without taking damage
Collect all experience in Dragon Graveyard
Collect all experience in Wolvercote Catacombs
Collect all experience in Academy Hallways
Kill 5 monsters (or 3 in Enchanted Edition) with a single physical object drop or throw
Complete Astral Academy
Collect all experience in Astral Academy
Launch the Enchanted Edition of the game
Complete the entire game on hardest difficulty (Hardcore mode not required)
Build a tower with at least 12 Wizard-created objects and stand on top of the tower without collapsing it
Complete Tower of Sarek without any deaths on hardest difficulty (Hardcore mode not required)
Survive a level other than Astral Academy without any damage
Conjure 200 objects in a single level
Complete a level other than Astral Academy without directly killing any enemies
Earn all Achievements in Trine