Anet devs, here is one easy way to make people stop hating the company whenever a Festival came up (and might make you look good on your annual review with your supervisor).
Please bring the old achievements back once a year per festival. A lot of us starts after HoT or PoF, and missed all of the good all days.
You can just bring 1 category back per festival, ie Blood and Madness 2013 this October, Blood and Madness 2014 next year October, A Very Merry Wintersday '12 this December and so on.
Heck, even charge us 1000 gems (or 2000 or 3000) to whoever wants to have those achievement categories, we will be happy to throw our credit cards at you.
Doing this will surely increase the players participating in the festivals as well.
Idk how to add picture, so here is the Reddit link to the achievement category that can be used.
https://preview.redd.it/yzj85njgecm71.png?width=2220&format=png&auto=webp&s=79bd58bf52da020e392b22bbaea952b0c22dd46f