I'm sure there's a really LONG list of stories that aren't on the archive.
And I believe the nfics are the majority of them. I remember from the top of my mind (because I already looked for them when I wanted to reread it and had to go hunting the TOCs):
From The Ruins by Alisha Knight
Inside Out by Editor Jax
Don't You Dare! by Darth Michael
Hell Hath No Fury Like A Woman Scorned by Darth Michael
Family Man by stopquitdont
Not Again by Kipp
Gfics:
Some Things are Meant to Be by Deja Vu Andreia (hoping to see these on the archive someday)