As described HERE! Categories, and how I fulfilled them, below. My list hits every decade from the 1920s to the 2020s, and 10 different countries.

5 Zombie Films:
- White Zombie (USA, 1932)
- Carnival of Souls (USA, 1962)
- Day of the Dead (USA, 1985)
- [REC]² (Spain, 2009)
- Train to Busan (S. Korea, 2016)

3 cult or conspiracy horror films:
- Wicker Man (UK, 1973)
- Children of the Corn (USA, 1984)
- Martyrs (France, 2008)

1 film from a Black director with a Black lead
- Candyman (USA, 2021)

1 film from a Mexican or Central American director
- Cronos (Mexico, 1992)

1 Canadian film
- Scanners (Canada, 1981)

1 Russian or former Russian state film
- Viy (USSR, 1967)

The most popular film from the 1940s that you haven't seen and can access..
- The Adventures of Ichabod and Mr. Toad (USA, 1949)

2 Post Apocalyptic horror films
- 10 Cloverfield Lane (USA, 2016)
- A Quiet Place Part II (USA, 2020)

1 Film with dreams or a dream as part of the plot
- Come True (Canada, 2020)

1 The animals are pissed at us film
- Alligator (USA, 1980)

1 Silent film
- The Man Who Laughs (USA, 1928)

4 based on Novels
- Eyes Without A Face (France, 1960)
- Manhunter (USA, 1986)
- Dead Ringers (Canada, 1988)
- Gerald's Game (USA, 2017)

Any film from THIS list that you haven't seen.
- The Host (S. Korea, 2006)

1 Ernesto Gastaldi written film
- Torso (Italy, 1973)

1 film from 1932
- Vampyr (Germany, 1932)

WIZARD of OZ ('39)
- The Wizard of Oz (USA, 1939)

And 1 Tobe Hooper Film (ALWAYS)
- The Funhouse (USA, 1981)

Extra:
- Burn Witch Burn / Night of the Eagle (UK, 1962)
- Trick or Treat (USA, 1986)
- The German Chainsaw Massacre (Germany, 1990)

...and to make it 31, and to have one from the 1950s:
- Diabolique (France, 1955)