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