Here is the full list of all 20 Abyss: The Wraiths of Eden achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Save your child from the hospital (additional content)
Unlock all the Achievements
Finish all hidden-object scenes without using any hints
Finish all the games of Domino
Complete the game (Expert Mode)
Finish all the mini-games without using the 'SKIP' option
Escape from the Laboratory
Scare the beast blocking your way
Collect the Flower from Greenhouse
Give a cute squirrel a nut
Finish half of all the games of Domino
Finish a game of Domino in less than 1 minute
Free yourself from the Restraining Vines
Make your way through the maze in the Agricultural section
Finish 3 mini-games in a row without using the Skip button
Finish 3 hidden-object scenes in a row without using any hints
Finish any hidden-object scene in less than 1 minute
Finish any mini-game in less than 1 minute
Finish any hidden-object scene with less than 5 misclicks
Find 3 hidden-objects within 3 seconds