UPDATE: 5/30/21
Multiple people have reported you now need 20 breaks in a ranked king of the hill match for this to unlock.
Ranked match king of the hill. It will take you 10 breaks in one match.
I was able to get 10 breaks in a single round.
The best strategy is to let them cap it, hang around the ring quickly run in and break, use your smoke to your advantage.
If you focus solely on breaks this shouldn’t be too hard.