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