Finally got this achievement. Had to do double up on the Hircine items for some reason. I smithed the ebony blade and I think that caused it to not count towards the achievement. After spending about 30 hours on a new character to wrap up all of these quests, getting all 15 and not hearing the achievement bleep... meh, if I wasn't happy drunk I'd probably have put my xbox through a wall.
tl,dr: don't smith any of the artifacts until AFTER you get the achievement.