I think a fun achievement to add would be for "longest chain" - Clear a chain of x cards without drawing from the pile. Not sure how long the chain should be, but certainly something challenging.
Eh. Luck achievements annoy me and a lot of the games recently for Epicon have had luck-based achievements. I don't think we need more. :|
I was just thinking about this as I played! I'd love a chain achievement, maybe with a nice title :3