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