Here is the full list of all 21 The Shattering achievements.
Game Completed
Back to reality
Put together the statue
Act 4 Completed
Ate the pizza
Act 3 Completed
Broke in and found the files
Act 2 Completed
Grabbed every toothbrush
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
The loop continues
Liar liar pants on fire
Approached all the children at playtime
Made it to the interview on the first try
Keep the cold out