HUMANKIND

Just collect every curiosity you see. This will likely take more than one run, as once the Neolithic era passes, curiosities seem to disappear. Still, if you're diligent, this shouldn't take more than two or three games to get.

EDIT: Apparently you don't have to progress past the Neolithic Age, so this can be done in one game. That said, it's a cumulative achievement, so staying in the Neolithic is not required.