Here is the full list of all 30 Eventide 2: The Sorcerers Mirror achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Find first glimmering mirror
Find half of all glimmering mirrors
Find all the glimmering mirrors
Find the first card with Imp
Find half of the cards with Imps
Find all the cards with Imps
Finish a Minigame in less than 1 minute
Finish three Minigames in a row without skipping
Finish all Minigames without skipping
Find 3 Hidden Objects in 3 seconds
Complete three Hidden Object Puzzles with no more than 5 mistakes in each one
Complete any Hidden Object Puzzle without using Hints
Finish any Hidden Object Puzzle in less than half a minute
Complete all Hidden Object Puzzles without using Hints
Make first moral choice in the game
Face consequences of your decisions
Get into Tvardovsky's domain
Heal wounded Yagna
Put the Wolf to sleep
Get away from the prison cell
Make elixir for Yanosik
Get into Tvardovsky's house
Help the Imp to assemble the necklace
Find proof for Yanosik
Defeat Tvardovsky
Free Jenny
Watch all the cutscenes from the first hour of the game
Read all the notes placed in the game
Talk with all Imps in the game
Play the game again and make different choices