This is part of the Hearthfire DLC. You are able to buy three plots of land, which are located in the regions of Falkreath, The Pale and Hjallmarch. You will have to talk to the Jarl in ssaid region and complete a quest to almost win their trust. The easiest I found is the Jarl of Falkreath who sends a courier with a message to you. Once the quest is completed, the Jarl will allow you to buy a plot of land in the area from their assistants. Once the land is purchased the achievement will unlock.