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