Family Feud :
Playing as the Court of Lybaras, kill 1000 Vampire Counts in a single battle.
I think i ran into a bug with this achievement.
I was playing as Argwylon in a Mortal Empires multiplayer coop campaign and my mate was playing the dwarfs.
The bug occured just at the end of the first quest battle I did with Durthu (the quest to get his sword).
In this quest battle I was facing a bunch of vampires and get the achievement even if I was not playing the Court of Lybaras...
I must add that I own TK's DLC but I never played with the Court of Lybaras faction.
Is this a known bug or something ?