Here is the full list of all 9 Onryo | 怨霊 achievements.
Bring all the Gachapons to the kid.
Read all 10 notes.
Use a magatama.
Die once.
Find the secret item.
Finish the game with ending 1.
Finish the game with ending 2.
Get rid of the daughters 10 times.
Defeat the mother.