Check out Cinemonster's list for more info - letterboxd.com/cinemonster/list/the-night-hooptober-came-home-hoop-tober/
QUICK EASY RULES:

6 sequels (mix-and-match. 6 total) - Bride of Frankenstein, Son of Frankenstein, Frankenstein Meets the Wolf Man, Frankenstein Must Be Destroyed, Day of the Dead, Evil Dead II
6 countries - USA, Germany, Japan, UK, Canada, Italy
6 decades - 20s, 30s, 40s, 50s, 60s, 70s, 80s, 90s, 10s (9 in my case, though nothing from the twenty aughts)
6 films from before 1970 - I count sixteen.
6 films from the following: Carpenter, Raimi, Whale, Browning, Craven, Tom Holland (mix-and-match, or all one) - Prince of Darkness, In the Mouth of Madness, Body Bags, Evil Dead 2, Bride of Frankenstein, The Unknown
3 people eating people (non-zombie) - I Drink Your Blood, The Texas Chainsaw Massacre, From Beyond
1 Hammer Film - Frankenstein Must Be Destroyed
1 Romero Dead film - Day of the Dead
1 terrible oversight (use the following link, filter out the films you've seen and picked the highest rated film from the list that you can get ahold of) letterboxd.com/films/genre/horror/by/rating/ - Psycho, seen it before, but not since starting letterboxd.

And 2 Tobe Hooper Films (There must ALWAYS be a Hooper film) (Salem's Lot, The Texas Chainsaw Massacre and Body Bags)

Edit 9/10 - The first 31 movies now fulfill all criteria. Moved a few difficult to find movies down for extra credit.