It seems this is still not working for some players.
I have killed the majority of the list, yet it remains at 0 for all. A guildie experiencing the same problem and I went to Alderaan and killed a droid on the list. When checking the achievement it didn't update and both of us apparently have none of the required kills even though we had just killed one of the targets.
There is obviously some issue / bug, so please fix it.