Wish This thread was still active. I just went through all the maps. Followed the two guides. Played each map until I got the notification. Some maps i got the notification during campaing, others i got during instant, but most of them i got during multiplayer . . . i don't think I missed anything.
I didn't replay them on other game modes. the warfare maps i only played original map title and its necris title (not the additional ones since they are mostly the same).
Pretty sure i missed something, but damn. sucks. after all that.