Carcassonne

This is easiest when done in local multiplayer. See "Count of Carcassonne" on how to set this up. Use both players to build a large city containing at least 9 tiles. Make sure to get a follower in the city with your main profile player, then complete it to earn this achievement. Do not go too crazy making a huge city that is impossible to finish. 9 tiles sounds like a lot, but the city will be surprisingly small.