No missable achievements (plus 20 unknown)
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Awaken at the campground.
Let the strange deer empower you.
Chat with F.K. for the first time.
Find the first Sleepy.
First, you need to find Emily.
Escape from something scary.
Get run over by a train.
Fall off a bridge.
Jump over that black thing!
Reach the top of the clock tower.
Complete the game.
Crane operation is dangerous work.
Select Continue after the ending and start a new run.
Don't get too addicted to your phone.
Read a hidden text from F.K. after finishing the game.
Find every Sleepy.
Acquire every donut.
Read all of the texts from the past.
Read all of F.K.'s hidden texts after finishing the game.