Here is the full list of all 10 The Secret of Hutton Grammar School achievements.
Just add water!
Why is that picture so familiar?
Better luck next time!
Knocked out the leader...
Found the secret entrance.
Turned off the fire alarm!
Nosey! Or ear-ey?
There's adventuring to do!
Oops, you set yourself on fire!
Can we call this a stealth game?