Here is the full list of all 36 TUNIC achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Had 10 moneybanks at once
Made 15 wishes
Found a certain weapon before getting a sword. (Page 38)
Found Secret Treasure #8
Found Secret Treasure #11
Found Secret Treasure #10
Found Secret Treasure #9
Found Secret Treasure #4
Completed the Manual
Found Secret Treasure #2
Found Secret Treasure #5
Found Secret Treasure #12
Found Secret Treasure #1
Found Secret Treasure #7
Found Secret Treasure #6
Freed a friendly fairy
Found your rightful place
Found Secret Treasure #3
Made a wish
Restored corporeal form
Earned the Cathedral's Prize
Froze yourself
Understood the margin of page 17
Completed key collection
Found the red key
Found the green key
Found the blue key
Engaged a strange device
Perfectly executed a special technique
Rang the Western Bell
Chopped down 1000 blades of grass
Made an offering
Rang the Eastern Bell
Found a sword
Was resurrected
Found a stick