Not sure how many of these are Cacoward winners or anything, but I think these should qualify as notable anyway. :)
50 Shades map 18 is still missing any demos. Rest of the maxtable is complete I think. It didn't seem up my alley, so I never beat it, not sure how hard it is.
The Journey maxtable is still pretty sparse
Toilet of the Gods only has map 1 at the moment, though these maps are hard. I think I'll try map 4 at some point, we'll see. :^)
Both Chex Quest 1 and 2 are still surprisingly low on demos, other than full runs at least. Chex 2, notably, has no maxes at all.
H2H-XMas should have pretty fun UV-Speeds IMO, but has very few of those.
On a personal level, I would like to see/might work on the following:
Completing the Perdition's Gate NM100 table. NM is already complete, only 3 and 27 left for NM100 (both pretty brutal, though, IMO).
Completed Scythe movies (missing NM100 episodes 2/3/D2ALL, UV-Max episode 3/D2ALL, NM-Speed D2ALL, UV -fast? episodes 2/3/D2ALL)