My first time doing this! 
Here are all the details, thanks to Cinemonster!
There must be 31 movies in the following categories, some movies count for 2 or more categories. Some of my movies are also rewatches.

6 countries (other than Italy or US)
Czechia: Valerie and her Week of Wonders
Hong Kong: The Cat
Ireland: Caveat
Japan: Best Wishes to All
Norway: The Ugly Stepsister
South Korea: A Tale of Two Sisters
9 Decades
1930s: White Zombie
1940s: I Walked with a Zombie
1960s: The Horrible Dr Hichcock
1970s: Blood on Satan’s Claw
1980s: The Texas Chainsaw Massacre 2
1990s: The Frighteners
2000s: The House of the Devil
2010s: Coherence
2020s: Strange Darling
5 Zombie Films:
Dead and Buried
The Girl with All the Gifts
I Walked with a Zombie
Splinter
White Zombie
3 Cult or Conspiracy Horror Films:
Blood on Satan’s Claw
Dead and Buried
In the Earth
1 film from a Black director with a Black lead: Tales from the Hood
1 film from a Mexican or Central American director: The Devil’s Backbone
1 Canadian Film: Anything for Jackson
1 Russian or former Russian state film: Viy
The most popular film from the 1940s that you haven't seen and can access: I Walked with a Zombie
2 Post Apocalyptic horror films: 
The Girl with all the Gifts
In the Earth
1 Film with dreams or a dream as part of the plot:
Enemy
1 The animals are pissed at us film: The VVitch
1 Silent Film: The Unknown
4 Films based on novels:
Clown in a Cornfield
The Girl with all the Gifts
Magic
Nosferatu
Any film from this list you haven’t seen: Smile 2
1 Ernesto Gastaldi written film: The Horrible Dr Hichcock 
1 Film from 1932: White Zombie
The Wizard of Oz
And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film): The Texas Chainsaw Massacre 2