Here is the full list of all 33 Shady Brook - there are A Dark Mystery Text Adventure achievements.
Cross a moral line.
Don't forget to visit your father on occassion.
Achieve a final score of at least 1000.
Use no hints
Complete the game.
Beat up two bullies!
Find the source of a bad stench.
Break out of jail.
Discover some unsettling evidence.
When you're in over your head, call the police.
Hear the last words of the deceased.
Witness something deeply disturbing.
Examine a stone etching.
Enter a series of underground passages.
Successfully navigate the mountains at night.
Prowl the town at midnight.
Trade a watch for some useful information.
Make a difficult choice for love.
Beat someone in a game of 8-Ball.
Replace a muffler.
Win a round of Rock, Paper, Scissors.
Properly adjust three mirrors.
Catch a fresh fish for a special occasion.
Do some laundry.
Find out what's on TV.
Find evidence of an affair.
Spy on an intimate moment.
Talk sports with some friends.
Find the way to Chief's cabin.
Experience an unwelcome break-in.
Search through someone's medicine cabinet.
Unpack your suitcase.
Bug someone repeatedly.