Here is the full list of all 27 Yomawari: Night Alone achievements.
Played a total of 50 hours
Collected all collectable items for your room
Collected all items
Completed the puzzle
Kidnapped by Mr. Yomawari
Picked up the Big Bell
Completed the radio
Made an offering to Jizo Statues a total of 50 times
Found the Tsuchinoko
Talked to Sis a total of 12 times
Cleared Chapter 7
Collected all usable items
Cleared Chapter 6
Cleared Chapter 5
Picked up a trophy
Opened Garbage Bags a total of 20 times
Cleared Chapter 4
Fed a cat
Cleared Chapter 3
Kicked the can a total of 50 times
Suffered a Game Over a total of 30 times
Hid a total of 50 times
Stayed home for a total of 15 minutes
Cleared Chapter 2
Played a total of 10 minutes without the flashlight on
Cleared Chapter 1
Cleared the opening