Original List by Cinemonster

Began: September 17, 2022 with Pearl (2022)
Completed: October 31, 2022 with Society (1989)

6 countries
Australia: Razorback (1984)
Canada: Shivers (1975)
France: Eyes Without a Face (1960)
Germany: The Golem: How He Came into the World (1920)
Italy: The Whip and the Body (1963)
Japan: Perfect Blue (1997)
South Korea: Thirst (2009)
Thailand: Countdown (2012)
United Kingdom: The Mummy (1959)
United States: Pearl (2022)

8 decades
1920s: The Golem: How He Came into the World (1920)
1930s: The Black Cat (1934)
1940s: I Walked with a Zombie (1943)
1950s: The Mummy (1959)
1960s: The Whip and the Body (1963)
1970s: Images (1972)
1980s: Razorback (1984)
1990s: Perfect Blue (1997)
2000s: Thirst (2009)
2010s: It (2017)
2020s: Pearl (2022)

2 insect centered films
Mimic (1997)
The Fly (1986)

1 horror film set in space or the future
It! The Terror from Beyond Space (1958)

2 animated films
Perfect Blue (1997)
Mad God (2021)

1 bloodthirsty old person/people film
The Exorcist III (1990)

2 1970s regional US films
The Texas Chain Saw Massacre (1974)
The Crazies (1973)

The worst horror sequel from the 1990s that you haven't seen and can access
Candyman: Day of the Dead (1999)

1 German Silent
The Golem: How He Came into the World (1920)

5 Films from David Cronenberg, Ti West, Bill Rebane, Charles B. Pierce, William Grefe and/or Joy N. Houck Jr.
Pearl (2022, West)
Shivers (1975, Cronenberg)
The Dead Zone (1983, Cronenberg)
The House of the Devil (2009, West)
The Fly (1986, Cronenberg)

2 Christopher Lee films
The Mummy (1959)
The Whip and the Body (1963)

1 film with a musician or band in it
Blade (1998)

1 Stephen King adaptation that is not the first go around
It (2017)

1 Lon Chaney film
The Hunchback of Notre Dame (1923)

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