Very simple trophy. All you have to do is make sure you win a fight while playing as Valkenhayn and only attacking while he's in wolf-form. Pressing D (
on default ) transforms him in to a wolf. You'll see a small purple meter at the bottom when you do this, once it depletes he will change back to his normal form. Simply let this refill and transform in to a wolf again and win while only attacking in this form to earn the trophy.