There must be 31 films
6 countries
France : Knife+Heart
Italy : Deep Red
Australia : The Badabook
Japan : The Happiness of the Katakuris
Korea : The Host
Canada : Clearcut

8 decades
1920 : Nosferatu
1930 : Frankenstein
1940 : Meshes of the Afternoon
1950 : Plan 9 from the Outer Space
1960 : Night of the Living Dead
1970 : Phantom of the Paradise
1980 : Inferno
1990 : Clearcut
2000 : Pulse
2010 : The Badabook
2020 : Crime of the Future

2 post apocalyptic or natural disaster related films
It Comes at Night
Mad God

1 film with Robert Englund
Eaten Alive

1 something is underground film
The Descent

3 Satan/Devil centered films
Inferno
The Blood on Satan's Claw
Black Sunday

1 Amicus film.
The House that Dripped Blood

The worst Dracula film (by Letterboxd rating) that you haven't seen and can access.
Argento's Dracula

1 LGBTQ+ connected film
Knife+Heart
Night Tide

5 Films from De Palma, Wes Craven, Ken Russell, Hitchcock
and/or Morehead & Benson.
Ken Russell : Altered States
Ken Russell : The Lair of the White Worm
Wes Craven: The Hills Have Eyes
Brian de Palma : Phantom of the Paradise
Moorhead/Benson : The Endless

2 Peter Cushing films
The House that Dripped Blood
The Vampire Lovers

1 film based on a work of or invoking the name Bram Stoker
The Lair of the White Worm

1 film based on a Clive Barker story
Nightbreed

1 film that was released the year that you turned 10
Fear X

1 Mario Bava film.
Black Sunday

1 film with an 'x' in the title
Fear X

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film)
Eaten Alive