Here it is, the ultimate list of splatter movies (according to the guy who coined the term "splatter movie"). Both volumes of The Official Splatter Movie Guide are compiled here, listing all of the pivotal and not-so-pivotal gorefests of the 70s, 80s, and early 90s.
There are some omissions in the list since at the moment they don't have a Letterboxd page. They are:
Brothers In Arms:
Situation (aka Slaughter Day):
Three movies were listed twice under different titles in Volume II. They are:
Zombie Inferno (here as Night Of The Zombies)
Alien Prey (here as Prey)
Bail Out (here as Witchery)
Forever Evil is actually in both books, but obviously it's on here only once.