With the addition of the new achievement of the upcoming Togetherness Event, "Game" achievements section seems to be reseted for most lvl 80 players, this mistake does that when they join the game, they get free +2300 gems when completing the "automatic" achievements (reach level 10,20,30,40,50,60,70,80), but the achievements that require that they join the game for a year won't get completed.
UK03-Sandycove
ES01-Tierras Salvajes
In the Spanish server screenshot, somehow this person didn't even get his "automatic" achievements completed, meaning he is lvl 80, and he hasn't even completed lvl 10 achievement.
People who doesn't have lvl 80 keep their original achievements (at least in my case with UK-03 Sandycove account, and several ones that I compared between on both servers).