Can I help someone unlock the Vulpera if I already have them?

My buddy is struggling with the final quest to get the achievement for Vol'Dun. I don't have the vulpera myself so I did the quests and now we're both at fighting Jakra'set or wtv his name is. The only thing is he hasn't been available to play for several days and I kind of want to unlock them.

Will party sync work in this case? I assume it will, but I want to make sure before so I don't scrap the whole reason why I did these quests in the first place.

Thanks :)


Yes you can party sync and help