Are the achievement prizes for donating to Charity going to be retired once Fireside is over?

I didn't see any announcement about this, so I think anyone who could answer you here is guessing. This year on the way to getting all the items that are new, I also got ones from 2013, so they didn't permanently retire last years' prizes. My guess is that since they retained their value quite a bit and were pretty unusual to start with that they will keep both years' for next year too..

I donated food to Charity throughout the year, because there were a couple of events where she was giving out stuff. At that time I had the top achievement. When they added the new tiers this year, I was awarded the new top tier without having given her anything additional. So I'm guessing that, yes, the achievement will remain active through the year even if she stops giving out Fireside items when you donate.

But as said, its all a guess.