It took me a moment to nab this one, so I thought I’d share some tips. If you’ve searched around online at all, you know that you CAN restart at the checkpoint immediately before you transition into the wolf, but as soon as you hit the checkpoint in the middle of the wolf run, you cannot restart at that middle checkpoint - if you die, you must restart the stage. This is kind of nice since the second half of the run doesn’t have as many enemies (but there is some annoying density to the walls / enemies that I’ll get to).
First off, when replaying the stage, don’t kill every enemy! I would kill everything up to the first checkpoint, kill 2-3 skeletons and then tank my way to the second (jump jump jump, i-frames), kill the first wolf guard after the spike-ball traps, then tank over to the cabin (third checkpoint). It will seriously save you so much time, and make this seem all the more doable.
Not many tips about the actual jumping and attacking as a wolf. Don’t worry too much about the danger behind you - it’s very forgiving if you miss a jump or hit a wall. When approaching groups of enemies, I found attacking a bit on the earlier side prevented me from getting hit as much (your attack goes much further than it feels like it will).
I was doing the first half very consistently (not that you have to with the checkpoint restart allowed there), but the second half would ALWAYS trip me up with the last wall and groups of enemies. Here was the tactic that got me this achievement first try after discovering it: on that last wall, be sure to break it with a midair (jump) attack! The animation is shorter, and allows you to attack sooner than the normal ground attack “surge forward”. If you jump attack the wall, you should have ample time to normal attack all the remaining enemies with ease.
Hope this helps someone, good luck!