Here is the full list of all 20 Araha : Curse of Yieun Island achievements.
Disable the lock.
Enter the derelict hospital.
Open the safe in the Director’s office.
Open the mortuary freezer.
Find the lipstick.
Find the hair comb.
Find the hand mirror.
Find the pocket watch.
Find the jade ring.
Examine the closed room.
Enter the underground sanctuary.
Find the final bones.
Cremate the bones.
Return to the derelict hospital.
Collect all 25 items.
Clear the normal difficulty.
Clear the hard difficulty.
Clear the very hard difficulty.
Operate the elevator multiple times.
Find 10 fried chicken coupons.