Here is the full list of all 20 The MISSING: JJ Macfield and the Island of Memories achievements.
Jump over that black thing!
Read all of the texts from the past.
Read all of F.K.'s hidden texts after finishing the game.
First, you need to find Emily.
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.
Don't get too addicted to your phone.
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.
Awaken at the campground.