Check out, when you’re parted with 3 or more guild members, guild achivs are going to be avaiable to complete.
I know this is’nt actually original idea (WoW) but this would actually really work even better in GW2, another thing that could do something to the community of guilds in GW2 like Guild Missions.
Just imagine that, Guild Halls are coming with Heart of Thorns, some achieves could unlock some nice shiny things, dunno, like banners, or even merchants, some skins, pets?
Main Core achieve (like God Walking Amongst Mere Mortals from GW1) could unlock some looks of Guild Halls, new emblams?
I know anet rather do thins or their own way, but just think about it you guys.