Port Royale 3

This requires you to have control over a town. Once you are the administrator, build a manor in your town. If your reputation with the nation you took the town from is still high enough, you can speak to the viceroy and ask to marry his daughter/son. You will need to collect a quantity of food and deposit it in the viceroy’s town. Once you have enough visit the town’s church and the achievement will unlock. A good time to do this is directly after finishing either one of the campaigns.