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