Here is the full list of all 33 Shady Brook - there are A Dark Mystery Text Adventure achievements.
Achieve a final score of at least 1000.
Use no hints
Complete the game.
Cross a moral line.
Beat up two bullies!
Find the source of a bad stench.
Break out of jail.
Discover some unsettling evidence.
Hear the last words of the deceased.
When you're in over your head, call the police.
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.
Don't forget to visit your father on occassion.
Replace a muffler.
Win a round of Rock, Paper, Scissors.
Catch a fresh fish for a special occasion.
Properly adjust three mirrors.
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.