Separate names with a comma.
Woot! UPDATE: That's also linked from the front page of the App Store now.
I've since started including the names of apps that I don't have lists for too. Nearly caught up with everything in this thread and other sources:...
Writing down teh lists... I've started compiling a list of the achievements in games I own at: http://www.disobey.com/wiki/Game_Center_achievements
