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