For this achievement you must counter Lewis' attack during the boss fight 10 times. At the end of the stage you will have to fight the boss named "Lewis". In the first part of the fight Lewis will drive around in his motorcycle attempting to run you over. Keep attacking him until his health bar is at zero. You will have the chance to finish him but do NOT! If you wait 20 seconds Lewis will get back on his motorcycle and start riding around again. Each time he charges at you with his motorcycle you will have a QTE (Quick Time Event) to do. After doing that Lewis will be knocked off of his motorcycle again. Rinse and repeat 10 times and the achievement is yours.
At the end of the 5th stage you will have to fight a boss called Lewis. In the first phase of the fight he will drive around on his motorcycle. Keep attacking him until his health bar is empty. The game will tell you to finish him, but don't do that! Just wait for a few seconds. Lewis will get back on his motorcycle and attack you. Stay in the center of the area and press Y when displayed. Complete the short QTE and repeat the process until the achievements unlocks.