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