Achievement after patch.
From a player standpoint its hard to say. I imagine the refugees would still want their items back even if in southsun BUT how long is anet going to leave the snow and dirt covered items in game?
They are all there now so I suggest just in case to get everyone who wants the achievement to get it now while it is definitely available.
They’ve kept the events for volunteering up this long. I would assume (but this isn’t law) that they will still be available until the Flame and Frost storyline finishes. The reason I say this is because in GW2 so far they usually keep the storyline title/achievement related stuff around as long as the event is around. Stuff from Early Halloween and Wintersday stuck around for the entirety of the event, and so far so has Flame and Frost. As I said though, this is a guess and nothing more. So if you have a chance I’d just grab it now while you still can.
Remember that Halloween and Wintersday was removed along with your chance for the achievements, they might be attainable next year but we won’t know till then. My advice is do the content now, you don’t need your guild for the 30-60 minutes of work for this whole event.
I have a question about these achievements.. are the title rewards and such attached to the character that completes it or are they available to the account as a whole? Do you need to do the event storyline for each of the characters that you play regularly?
Achievement points and titles are awarded to the account.