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