The Witcher 3 Wild Hunt All Fistfighting Quests Locations will guide you on finding them all.
In the The Witcher 3 Wild Hunt All Fistfighting Quests Locations will guide you on finding all the different quest where you will be finding the fistfighting Quests. There are 14 fistfights that you must win to unlock the Brawl Master trophy / achievement. There are 4 in Velen, 4 in Novigrad, 6 in Skellige in the map where you will find them. Once you complete the Fistfighting Quests you will unlock the Brawl Master Achievement or trophy in the game.
When you take on the Fistfighting quest you will need to approach the bookie and when you are fighting make sure you strike each of your opponents with 3 good punches and you will knock them out. Unlocking the very last fight requires you to complete a side quest to get rid off a wraith that haunts the arena. Follow the Video guide below to show you where to find each location and how to defeat each.