Medieval Dynasty (Xbox One)

The main quest the achievement is referring to is the seven Uniegost's Story quests that start at the beginning of the game. These quests will have you running/riding across the map as the story unfolds and as you complete each chapter of the story your settlement building limit will increase allowing you to obtain the settlement level achievements. Once you complete the last quest nd made the finally decision a cutscene will play and the achievement will pop.