Cinemonster's List: boxd.it/7phpm
Organized chronologically with criteria in the description.
QUICK EASY RULES:

6 countries
Audition (Japan) - Deep Red (Italy) - Veronica (Spain) - Funny Games (Austria) - The Babadook (Australia) - A Tale of Two Sisters (South Korea)

6 decades
- 40s - 50s - 70s - 80s - 90s - 00s

7 2nd films of franchises
- TCM2 - Scream 2 - Exorcist 2 - Halloween 2 - Ringu 2 - Phantasm 2 - Saw 2

4 body horror films
- Videodrome - Shivers - The Thing - Rabid

2 films from this year
- Sputnik - Relic

3 disease based films
- Cabin Fever - 28 Days Later - The Crazies

The highest rated horror film from the 50s that you haven't seen and can access.
- Diabolique

1 film that is set entirely inside one location
- The Mist

1 Invisible Person film
- Invisible Agent

1 Non Dracula Hammer Film
- The Mummy

2 films with a black director or predominantly black cast or lead.
- Get Out - Blacula

1 film with a movie theater in it.
- The Blob

And 1 Tobe Hooper Films (There must ALWAYS be a Hooper film)
- The Funhouse

***FOR THOSE THAT LIKE TO DO EXTRA WORK: WATCH The Witch Who Came From the Sea and Cube 2: Hypercube