I tried to do this challenge 2 years ago, but I didn't watch nearly enough movies back then to realistically complete it. Now there shouldn't be any issues considering I watch at least
1 movie per day. Didn't add the extra movies yet, but if I have spare time I'll watch them.

The list:
6 countries
̶U̶S̶A̶ ̶-̶ ̶J̶a̶w̶s̶ ̶1̶9̶7̶5̶
̶A̶u̶s̶t̶r̶a̶l̶i̶a̶ ̶-̶ ̶W̶o̶l̶f̶ ̶C̶r̶e̶e̶k̶ ̶2̶0̶0̶5̶
France - Diabolique 1955
̶U̶K̶ ̶-̶ ̶A̶n̶ ̶A̶m̶e̶r̶i̶c̶a̶n̶ ̶W̶e̶r̶e̶w̶o̶l̶f̶ ̶i̶n̶ ̶L̶o̶n̶d̶o̶n̶ ̶1̶9̶8̶1̶
Estonia - Dead Mountaineer’s Hotel 1979

8 decades
Diabolique 1955
̶T̶h̶e̶ ̶H̶a̶u̶n̶t̶i̶n̶g̶ ̶1̶9̶6̶3̶
J̶a̶w̶s̶ ̶1̶9̶7̶5̶
̶E̶v̶i̶l̶ ̶D̶e̶a̶d̶ ̶I̶I̶ ̶1̶9̶8̶7̶
̶I̶ ̶S̶t̶i̶l̶l̶ ̶K̶n̶o̶w̶ ̶W̶h̶a̶t̶ ̶Y̶o̶u̶ ̶D̶i̶d̶ ̶L̶a̶s̶t̶ ̶S̶u̶m̶m̶e̶r̶ ̶1̶9̶9̶8̶
̶W̶o̶l̶f̶ ̶C̶r̶e̶e̶k̶ ̶2̶0̶0̶5̶
Wolf Creek 2 2013
̶M̶a̶l̶i̶g̶n̶a̶n̶t̶ ̶2̶0̶2̶1̶

2 insect centered films
̶T̶h̶e̶ ̶B̶e̶e̶s̶ ̶1̶9̶7̶8̶
̶T̶h̶e̶ ̶F̶l̶y̶ ̶1̶9̶8̶6̶

1 horror film set in space or the future
̶P̶a̶n̶d̶o̶r̶u̶m̶ ̶2̶0̶0̶9̶

2 animated films
Vampire Hunter D 1985
The Wolf House 2018

1 bloodthirsty old person/people film
̶A̶m̶e̶r̶i̶c̶a̶n̶ ̶G̶o̶t̶h̶i̶c̶ ̶1̶9̶8̶7̶

2 1970s regional US films
̶T̶h̶e̶ ̶L̶a̶s̶t̶ ̶H̶o̶u̶s̶e̶ ̶o̶n̶ ̶t̶h̶e̶ ̶L̶e̶f̶t̶ ̶1̶9̶7̶2̶
̶I̶ ̶S̶p̶i̶t̶ ̶o̶n̶ ̶Y̶o̶u̶r̶ ̶G̶r̶a̶v̶e̶ ̶1̶9̶7̶8̶

The worst horror sequel from the 1990s that you haven't seen and can access.
Sleepaway Camp IV: The Survivor 1992

1 German Silent
Nosferatu 1922

5 Films from David Cronenberg, Ti West, Bill Rebane, Charles B. Pierce, William Grefe and/or Joy N. Houck Jr.
̶T̶h̶e̶ ̶T̶o̶w̶n̶ ̶T̶h̶a̶t̶ ̶D̶r̶e̶a̶d̶e̶d̶ ̶S̶u̶n̶d̶o̶w̶n̶ ̶1̶9̶7̶6̶
̶N̶a̶k̶e̶d̶ ̶L̶u̶n̶c̶h̶ ̶1̶9̶9̶1̶
eXistenZ 1999
̶T̶h̶e̶ ̶H̶o̶u̶s̶e̶ ̶o̶f̶ ̶t̶h̶e̶ ̶D̶e̶v̶i̶l̶ ̶2̶0̶0̶9̶
Pearl 2022

2 Christopher Lee films
The House That Dripped Blood 1971
̶T̶h̶e̶ ̶W̶i̶c̶k̶e̶r̶ ̶M̶a̶n̶ ̶1̶9̶7̶3̶

1 film with a musician or band in it
The Hunger 1983

1 Stephen King adaptation that is not the first go around.
̶P̶e̶t̶ ̶S̶e̶m̶a̶t̶a̶r̶y̶ ̶2̶0̶1̶9̶

1 Lon Chaney film
The Phantom of the Opera 1925

1 Tobe Hooper film
Poltergeist 1982