Here’s a neat little tool: Pugchecker. All it does is take all the info on boss kills from your armory profile and display it in an easy to read numbered format, ordered by dungeon.
One caveat, apparently Drak’tharon Keep is very buggy about granting kill credits for Tharon’ja - if you’re dead or in skeleton form, you won’t get the credit (and often won’t get the achievement). I guess I got lucky. Anyway, here’s my Pugchecker page. Kind of cool!