From Rampage Knights Wiki
How to beat the challengechallenge you have to kick 200 enemies so they fly to the sides. Players can kick an enemy by attacking when in close proximity. Large enemies, such as Giants and Bosses cannot be sent flying by a kick. Enemies wielding shields must first have their shield broken using Jump Attacks (jump up and press the attack button in the air) or Dash Attacks (hold attack button then press left or right) before they can be damaged by a kick.
Kick damage +20.