Here is the full list of all 21 TOHU achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Click on the claw
Enter credits page
Complete the game
Create the radio gun
Talk with all characters
Collect all creatures
Let them eat
Listen to all the musicians tracks
Drop the pirate into the water
Move from the past to the future
Go 5 times into the fog
Click on any of 9 birds
Enter the correct code
Give the wrong potion to the prisoner
Make the trader to run 3 times
Let the Samurai to spot you 5 times
Try to apply the glove on a hand
Fall down
Try all moles combinations
Click on the rat two times
Click on amanitas two times