I doubt this one would happen. It sounds like alot of extra coding work for a feature that wouldnt actually be of much use. Not to mention this sort of thing is usually not really associated with action roguelikes.
I think what would be really good is a scoreboard system of some kind. This would be super shmuppy and not something that other similar games have I don't think. We could also have it as an online leaderboard... I say we could, what I really mean is in a super ideal world where SR actually sold decently then perhaps implementing something like this would be feasible and awesome, but unfortunately that's not the world we're in, heh.
For the fun of it, how would a scoreboard work?
Each category of enemy would give a certain score value.
Perfecting a boss would double that score value.
Perfecting a floor would give a bonus.
Collecting items would give points...
... not sure. If perhaps we could come up with a reasonable scoring formula then that would make having a scoreboard that tiny bit likelier.
As an aside, the concept of perfects in this game is SUPER unintuitive. Everybody in gaming knows that getting a perfect means that you kill X enemy without losing life. That's it. It doesn't mean killing X enemy and not using X item or not using this other X item. As an example, I'm still not 100% clear on what a perfect actually is in this game, heh. I really think we should move to the simpler definition that everybody knows. If the player uses a bunch of missiles to achieve this end then that seems fair enough to me, if they're good enough to use their missiles defensively then nice.
The amount of posts I've read that say "I perfected the boss but didn't get the achievement" seems to suggest that the current definition is way too unintuitive.