Fencer: I know it does not count when a player times-out (I've been through that situation on a massacre chess game where I did not capture any queen in the first eight moves, and it seemed that I was going to win, but my opponent timed-out so no achievement), so probably on a resigned game it's the same, since both games ended up unnaturally
As for the "counting" of achievements (although it is not exactly an achievement problem), the system keeps mis-counting the won team tournaments (once a bug has been posted by pauloaguia, because the fellowship Tugas had won a tournament ,but still showed 0 victories, and we have won two tournaments (one of camelot Jan 2009 Coulrophobia (Camelot) - and one of portuguese checkes Hogfather, but only one of them was creditted to us. As a consequence this one does not count for the "won team tournaments achievement"