10 0 1Actions Report Solution Once you reach a population of 850, you can buy one more map tile. Hold then choose "new areas", then click on the direction in which you wish to expand your city and the achievement unlocks.Showing only comment. Leave a comment. The cost of the map tile is not static at $5000, it differs by tile and other factors. My first expansion tile was $2400, for example. Still, +1Posted by iMaginaryy on 21 Oct 17 at 02:27 Leave a comment