To unlock this achievement you will need to establish a total of 8 outposts. Depending where your Home Base is there will be a limit to how many outpost you can build until you move into the Snyders Trucking Warehouse. The warehouse will give you 8 slots in which to build the 8 outposts. You do not lose any outposts built at other Home bases when you move. To establish an outpost you will need to enter a building and clear it of any zombies. Once cleared press up on the D-Pad and you will see an option to Establish an Outpost. Creating outposts will cost you 50 influence. Establish a total of 8 outposts and this achievement will be yours.