Achievements!

Y'all know I'm more of a reader than a poster here, so imagine my surprise to receive multiple "achievement" notifications from LJ - including from a Dark Shadows role-playing account from more than a few years ago. Just got one from this account. On the former, I thought I must have gotten hacked and changed the password, but now I suspect it might not be I being hacked. I've also gotten notifications on-site that a couple of friends here have achieved things. So, what's up?