Jack of all trades, melee not completing

[ImmerFertig]

I've found a few youtube videos with the same issue but could not find it posted here. I'm trying to get the Jack of All Trades achievement. My character has a 2-handed skill of 50 so TTD is available. I'm using the Prismatic Hammer. I've one-hit killed about a dozen guys while sneaking with "blind" showing. I've also killed a couple of canids. The achievement won't award. Comments online say that other people are encountering the same issue, so I wanted to make sure the developers know about it. Once I get a decent ranged weapon, I'll try with that. Has anyone gotten this achievement with a melee weapon?

I'm playing on Xbox if that helps troubleshooting.