A little tricky, and easier with a second controller. To earn this, you need to perform critical counter damage, 10 times. This means you need your opponent to perform a critical counter, and then hit him before it can start. To do this, have your second player, or controller attack player 1, until the green gauge under the life gauge is full. The button varies on the character I do believe, so try either  or , you'll know when your doing it right because the punch/kick will glow before hitting. When it connects, have player 1 immediatly hit a light attack (  or  ). Do this 9 more times, and the trophy's yours.