What about a new category where you kill each individual enemy/npc (if they respawn killing them a second time is not required). This also would require a mod counting the completion i suppose cuz theres too much targets to keep track of. Inspired by hollow knight's grass% speedrun goal of which is to destroy each grass object in the game at least once while a mod keeps track of your progress. What do you think of the idea of having anything like that?

Be the change you want to see and run it. Not everything needs a leaderboard.