Here is the full list of all 8 Momodora III achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Kill Bakrog Demon within 30 minutes and then talk to Mariel.
Find the golden ladybird in Belltower Garden!
Defeat Haegok.
Finish the adventure without murdering any common enemy.
Finish the adventure within 25 minutes.
Watch ending "B".
Watch ending "A".
Kill the innocent owl in Belltower Garden.