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
Derrick Tyler's Story
Charles Roberts' Story
Andrew Reed's Story
Best Friends Forever
The Secret Lies With Her
Case Unsolved
Missing Journalist
Truth Revealed
All Keys Found
Matthew Brooks' Story
Steve Moss' Story
Bloody Knife
Bernard Hopkin's Story
Wanda Tyler's Story
All Tools Found
Oliver Gibson's 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
Guest's Lost Cap
Dying Man's Letter
Vivian Roberts' Story
Mary Martinez's Story
Trisha Roberts' Story
Tutorial Completed
James Howard's Story