Daily Guardian or X Winner has not appeared in the list of Dailies for over 2 weeks now.
https://forum-en.gw2archive.eu/forum/info/updates/Game-Update-Notes-November-17-2015
“Playing in unranked PvP matches will no longer progress Guardian achievements when not playing as a Guardian”
I think they changed something there in the last patch 14 days ago.
I only play Guardian, that’s why I noticed.