Cultural VictoryEdit
Main article: Cultural victory (Civ5)
Cultural victory is achieved by filling out five trees of social policies and completing the Utopia Project. Each tree has 5 policies, so in order to win you must have acquired 25 social policies in 5 different policy trees.
Social policies are acquired with Culture, with the cost increasing for each new one. Also, founded and annexed cities increase the amount of 20xCulture5 Culture needed depending on map size, which makes this path very hard for large empires. To work around this issue, you can limit the foundation of new cities and, when capturing other players' cities, you can make them puppets instead of annexing them.
Cultural Victory in Brave New WorldEdit
In the Brave New World expansion pack, Cultural victory conditions change dramatically, and we have what appears to be a "Cultural Domination" victory. The task is to use the new Tourism game mechanics to influence all other civilizations still in game and achieve at least the Influential level of cultural influence with each one.
Based upon the difference between a civ's 20xTourism5 Tourism and others' 20xCulture5 Culture, there are six possible stances: Unknown, Exotic, Familiar, Popular, Influential, and Dominant. The difficulty is to increase your cultural influence from 20xTourism5 Tourism with other civilizations, while at the same time protecting your own civilization from their influence using 20xCulture5 Culture.