Here is the full list of all 15 Quiet Valley achievements.
You found the first key!
You're stuck in a loop...
You freed the children!
You found all the secrets!
When you gotta go, you gotta go!
Something's lurking in the basement...
Wonder what I could use this for...?
There's nothing left to read...
You found the flashlight!
Bet the janitor has been looking for this...
Hope I don't have to use this...
That hits the spot!
Not too shabby!
I'm afraid it's just too darn loud!
Don't step in the broken glass!