Sorry dev, but this is stupid. Implementing an achievement, that is only available for a few days is not user friendly. Nobody wants to wait a whole year, just because they missed to get the achievement. Besides, if the dev stops implementing the events every year, no new players will ever get those achievements ever again and therefore will never ever be able to get the game to 100% So please, remove the achievements or make the events available all year, like Gearbox did it with Borderlands 3. They switched from activating them there and then to, being able to activate them from the main menu anytime you want