2 Post apocalyptic or natural disaster related films
The Road (US) 2009
The Last Winter (Iceland) 2006

1 Film with Robert Englund
Behind the Mask (USA) 2006

1 Something is underground
Tremors (USA) 1994

3 Satan/Devil centered films
The Omen (US) 1976
Twins of Evil (UK) 1971 (ft. Peter Cushing)
Rosemary’s Baby (US) 1968

1 Amicus film
At the Earth’s Core (UK) 1976 (ft. Peter Cushing)

The worst Dracula film (by Letterboxd rating) that you haven't seen and can access.
Nosferatu in Venice (Italy) 1988

1 LGBTQ+ connected film
Knife+Heart (French) 2018

5 Films from De Palma, Wes Craven, Ken Russell, Hitchcock and/or Morehead & Benson
The Devils (UK) 1971
Phantom of the Paradise (US) 1974
The Fury (US) 1978
After Midnight (US) 2019
To Catch a Thief (US) 1955 (yeah yeah not one of Alfred's scary ones but it's a needed change of pace by that point in the lineup)

1 film based on a work of or invoking the name Bram Stoker
Dracula (US) 1931

1 film based on a Clive Barker story
Candyman (US/Canada) 2021

1 film that was released the year that you turned 10
Dark City (US) 1998

1 Mario Bava film.
Planet of the Vampires (Italy) 1965

1 film with an 'x' in the title
Jason X (US) 2001

General entries to help me reach 31 that I haven't seen or have seen only once:
No One Will Save You (US) 2023
Climax (France) 2018
Landlocked (US) 2021
Possum (UK) 2018
Kwaiden (Japan) 1964
Terrified (ARgentina) 2017
Eraserhead (US) 1977
Night of the Creeps (US) 1986
House (Japan) 1977
The Night Flier (Italy/US) 1997

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film)
The Texas Chain Saw Massacre (US) 1974