"Conquest of the World" is not 350 BC

Not sure this has already been reported, but I got the "Conquest of the World" achievement by defeating all "Met" players in 75 AD. The achievement text says 350 BC, so either the text is wrong or there's a bug. Not that I'm complaining. It was hard enough to take over a continent on Immortal by turn 118! By Turn 100 would have required perfect tactics and build order. Doable, but damn!