Win using the keyboard. If you did not have a wired controller, you most likely have gotten this already. This can also be earned in Versus mode with a Wired controller. From the main Menu, hit ENTER using the keyboard so your main profile is assigned as the "Keyboard" player. Go into Versus mode and select your characters. Simply beat your opponent and this will unlock at the end of the match.
If you do not have a wired controller, make sure the difficulty is set to Beginner with 1 round and select Jin Kisaragi as your character. Once the match starts simply press the down key, left key and then the K key in sequence fast. If done correctly Jin will perform his Ice Car attack. Simply repeat until the enemy is dead.