Here is the full list of all 20 The MISSING: JJ Macfield and the Island of Memories achievements.
Read all of F.K.'s hidden texts after finishing the game.
Acquire every donut.
Read all of the texts from the past.
Find every Sleepy.
Don't get too addicted to your phone.
Read a hidden text from F.K. after finishing the game.
First, you need to find Emily.
Select Continue after the ending and start a new run.
Complete the game.
Reach the top of the clock tower.
Escape danger.
Fall off a bridge.
Get run over by a train.
Crane operation is dangerous work.
Escape from something scary.
Jump over that black thing!
Find the first Sleepy.
Chat with F.K. for the first time.
Let the strange deer empower you.
Awaken at the campground.