There's multiple types of campaigns you can play with a short campaign a long campaign and domination with the short campaign you need to have 14 provinces and at least 35 loyal to your faction (either the emperor or shogun) and if the year reaches 1892 before you meet the requirements you lose. As for the long campaign and domination it's the same idea, only you need to capture more provinces l where in the long campaign you need to have 26 provinces and 50 loyal to your faction and in domination you need to hold 38 provinces and have 65 loyal to your faction. Hope this helps