I've got 5 more for Skyrim, about to knock out 4 at once essentially (Thu'um Master, Lvl 50, and the 2 final missions)...after that I have to bring the Thieves Guild reputation up and then that's it (until the expansions)
I got 12 more in Fallout 3, I've got to beat 2 more expansions (Zeta and The Pitt) and a few minor achivements (reach lvl 8 evil/neutral...ect)
If they didn't come out with DLC for New Vegas I had about 3-5 left in that one too, haven't touched New Vegas in a minute.
Skyrim should be my first 100%, after that I might work on Red Dead Redemption or GTA 4.
WORK.READ.EAT.SLEEP.MUSIC.TV.PHOTOGRAPHY.INTERNETS.
£a╦ ƒÖÖdz