For this achievement you will need to unlock all of the safehouses, as well as complete all of the safehouse missions in Burial Point. There are 8 different safehouses available in Burial Point, each will contain 2 missions on the board that must be completed. The safehouses are as follows:
Founder's Knoll Safehouse
Chickering Safehouse
Winslow Fields Safehouse
Ashumet Springs Safehouse
Howl's Neck Safehouse
Haven's Lot Safehouse
Brighton Bay Safehouse
Direcliff Safehouse
Once both missions for all 8 safehouses (16 missions in total) have been completed, the achievement will unlock.