Malpractice Needs More Practice
Story-Based achievement.
Beat Jokers first test-subject. the mini-boss will throw dead bodies at you, run at you at you, and do a ground punch to clear you away from him. You're newly taught evade skill will come into use when he is throwing and running at you. while he was running i evaded and batarang'ed his face. afterwards he ran into the wall and I combined a couple combos after that and it popped. He does this blind swinging move after a couple combos and after he recovered all it took was another batarang to the face to pop this achievement.