Season 13 added!
Every movie ever riffed by Mystery Science Theater 3000 including the KTMA season and the movie. I had to add a few movies to Letterboxd myself so right now, this is the only complete list on Letterboxd.
They reriffed a number of movies from their KTMA season later on and Master Ninja was split into two episodes which is why the total episode numbers differ.
Several movies went by a different name than is shown on Letterboxd. I've added the "MST3K" title as well as the season and episode number for all the movies in the notes so look there if you can't find a particular movie title.