This is a story trophy and cannot be missed!
Staying airborne and using the various throwables around the arena are key to beating him.
There will come a point where he summons minions but you can simply ignore them and keep swinging around while throwing objects at him until he tires, when that happens you can do some actual damage. Combos do more damage than single punches/kicks.
Just keep swinging and he'll be defeated in no time!