Here is the full list of all 33 The Painscreek Killings achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Case Unsolved
All Letters Found
Dorothy Patterson's Story
Guest's Lost Cap
Dying Man's Letter
Truth Revealed
Charles Roberts' Story
Missing Journalist
All Keys Found
Steve Moss' Story
Bernard Hopkin's Story
Bloody Knife
Wanda Tyler's Story
Best Friends Forever
Oliver Gibson's Story
All Tools Found
Sofia Miller's Story
All Newspaper Articles Found
Here Lies Sofia
Scott Brooks' Story
Scott's Secrets
Derrick Tyler's Story
Trisha Roberts' Story
Vivian Roberts' Story
The Hidden Truth
Matthew Brooks' Story
The Secret Lies With Her
Mary Martinez's Story
Andrew Reed's Story
Tutorial Completed
James Howard's Story
You're Fired
Completionist