its the muck achievement that no one has done
its the stoopid one that u have to use a rock only, no damage and that stuff

you may know that rock can only destroy oak trees, but it is possible to use enimies to destory them.
thats the only part which seems impossible. But with gamer mode and no damage its even more harder
good luck beating this, try to dodge the mobs and stand ontop of a pillar to avoid their attacks.