There must be 31 films: 
6 countries - Dead Alive (New Zealand), Amsterdamned (Netherlands), Diabolique (France), Hello Mary Lou: Prom Night 2 (Canada), Cold Prey (Norway), Pulse (Japan)
8 decades - 40’s (Rebecca), 50’s  (Hound of Baskerville), 60’s (Blood and Black Lace), 70’s (God Told Me To), 80’s (Death Spa), 90’s  (I Know What You Did Last Summer), 2000’s (The Others), 2010 (Skin I Live In)
2 post apocalyptic or natural disaster related films (Threads, Twister)
1 film with Robert Englund (NOES 4)
1 something is underground film (My Bloody Valentine)
3 Satan/Devil centered films (The Exorcist, Angelheart, Jacob’s Ladder)
1 Amicus film (Tales from the Crypt)
The worst Dracula film (by Letterboxd rating) that you haven't seen and can access. (Dracula 2000)
1 LGBTQ+ connected film (Arrebato)
5 Films from De Palma (Body Double), Wes Craven (Red Eye), Ken Russell (Altered States), Hitchcock (Rebecca) and/or Morehead & Benson (Resolution)
2 Peter Cushing films (The Hound of the Baskervilles + Tales from Crypt)
1 film based on a work of or invoking the name Bram Stoker (Bram Stoker’s Dracula)
1 film based on a Clive Barker story (Lord of Illusions)
1 film that was released the year that you turned 10 (Wolf)
1 Mario Bava film (Blood and Black Lace)
1 film with an 'x' in the title (The Exorcist)
And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film) - Lifeforce