Weapon Master achievement bug
At least some of the utility skills will count for those but which weapons they count for is far from obvious.
I do know that the golem is also the cause of sword master kills.
Provoke – 80 Necromancer – Darkhaven
Hylie – 80 Guardian – Darkhaven
Hylie – 80 Guardian – Darkhaven
You can find a list in the wiki of some of the skills that count toward various Weapon Master Achievements. I don’t think it is considered a ‘bug’ by the Devs.
But, if it is, I doubt it will be ‘fixed’ for a long time.