I did some clicking on the 5 AV rep on wowhead and found another mob that gives 5 rep to AV and does not say that it stops at revered like the previous mob. Here is that mob:
http://www.wowhead.com/npc=13096
I believe what we have here is a race to see who gets Justicar/Conqueror first

That is unless they both stop at revered and one just isn't marked on wowhead... The biggest effort in getting that achievement would be getting the AB rep, I would imagine, given that nobody Q's for AB in 19's. Somehow though it might be possible. Dopest title in game imo... /drool