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