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