I just got this achievement and I'm a little confused. I apparently missed a day because I didn't get the Chubby Goldfinch Ornament (I bought it later when I realized I was missing it) or Chibi Peppermint Charlie Plushie. So my question is: Does visiting Melody for 25 days count for the achievement even if they weren't all in a row? Because "every day from the 1st through the 25th" definitely sounds like I shouldn't have gotten it. Plus the fact that the 2020 achievement says it's retired now. And if it is a glitch, I'm not sure if I should file a ticket.

It's supposed to only be for the first 25 days, not any 25 days in December. This is an old glitch that seems to happen every year. When it happened to me I was told that it's really hard to fix because this is the only time of year it can be tested for, or something like that.

In any case, I recommend filing a ticket. I don't know if they'll clear the achievement or tell you to delete the prize (I had to) or what, but if nothing else it'll go on record that this is still a thing. =

Thanks for the answer!