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