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