The easiest way to obtain this, (like many other trophy of the game), is to doing that in Tutorial mode.
Complete it until you can move in the village, at the entry, you'll find a chest, take the bones inside, go to the left, you'll see a farm with animals in cages, there is two wolves.
NOW save your game, and tame the wolves.
Then exit the game WITHOUT saving, and restart the game, tame the wolves (the two), and repeat until the trophy falls.3,4 times should be enough.
Video (credit to imjocavs)