I just earned an achievement in Hasbro Family Game Night. The "achievement unlocked" system message popped up on screen like always, but the achivement is not showing up on my card! Now I'm concerned that I won't be able to get it at all. This concerns me, because I know that the achievement unlocked notification is typically a system message saying that something has registered from XBLA; so it doesn't seem like a simple game bug would do this.
I've heard of achievements not popping at all before, but I've never seen one that popped and didn't show up...