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
Completionist
Truth Revealed
All Letters Found
Wanda Tyler's Story
Missing Journalist
Matthew Brooks' Story
Charles Roberts' Story
All Newspaper Articles Found
All Keys Found
Best Friends Forever
Oliver Gibson's Story
All Tools Found
Sofia Miller's Story
Dorothy Patterson's Story
Vivian Roberts' Story
Bernard Hopkin's Story
Bloody Knife
Steve Moss' Story
Here Lies Sofia
Scott Brooks' Story
Scott's Secrets
The Hidden Truth
Derrick Tyler's Story
Trisha Roberts' Story
Mary Martinez's Story
The Secret Lies With Her
Dying Man's Letter
Andrew Reed's Story
Guest's Lost Cap
Tutorial Completed
James Howard's Story
You're Fired