I think it would be fun and healthy for the community to have 100% runs for each world. Rules could be discussed and agreed and variations put in place if really needed (e.g. glitchy or glitchless).

so like how XBL has their leaderboard for level completion?, not sure how you could do that for N64

This is the best place I've found for something like this - https://cyberscore.me.uk/game/384

Most of the top speedrunners can beat every single one of these consistently though, so it's not a good indicator of what each record might be. RTA runners in BK and BT don't care for IGT all that much, so that's the reason there aren't any here if I had to guess.