Here is the full list of all 21 The Shattering achievements.
Game Completed
Back to reality
Act 4 Completed
Keep the cold out
Act 3 Completed
Made it to the interview on the first try
Act 2 Completed
Smartest kid in the class
Collected all 9 drawings
Act 1 Completed
Cracked the safe code
Found the scissors
Found the torn photo piece
Discovered the balloon's secret
Grabbed every toothbrush
Broke in and found the files
Ate the pizza
Put together the statue
The loop continues
Liar liar pants on fire
Approached all the children at playtime