Here is the full list of all 6 Harrowed World: What's Past Is Portents - there are Vampire Visual Novel achievements.
Became a lamb to the slaughter in Isaac's Story.
Enquired about the nature of vampires in Isaac's Story.
Confronted Father Angelo about his actions in Isaac's Story.
Completed Isaac's Story.
Found out about watcher angels and their apparent connection to the vampires in Isaac’s Story.
Enquired about the beliefs of the vampires in Isaac's Story.