I'm having issues with this goal and what is required. I had it pop up (send 10 villagers to another region) when I only had one occupied region, and sending the 10 villagers to an unoccupied region doesn't seem to trigger it. I'm unsure if this requires sending villagers to an established region (one with a village, which I haven't tried yet), it is bugged, or I did something wrong. (I can't see that I did anything wrong.)
Thanks for any assistance ahead of time.