I am encountering a recurrent problem. World boss kills are not registering. So far this has happened for 3 of the world bosses in DC VR1 Auridon; Nestmother's Den, Wreck of the Raptor, and Seaside Scarp Camp. I have had to kill each several times in order for the achievement of killing them to register.
It seems I'm not the only person to experience this either, several other players commented in zone chat that they'd had the same problem. Sent a bug report so hopefully this gets looked at.
ESO; Where the issues far outnumber the fixes.
I tell it how it is.