There are multiple winners in this campaign, and one “overall” winner.
The Explorer: The warband who has explored/visited the most districts.
The Merchant: The warband with the highest remaining gold unspent.
The Master & Teacher: The player whose warband leader has the most experience.
The Regulator: The player with the highest warband ranking value, excluding unspent gold
The Conqueror: The Player who controls the most districts at campaign end.
Overall Winner: Both the “Regulator” and the “Conqueror” fight-off in a battle scenario chosen at random. The winner is declared the campaign overall winner. If the same player is already the “Regulator” and “Conqueror” then they automatically have won.