Lost 1k achievement points?
I love Sirean. <3
You get your first zenith weapon skin at 1000 points. You don’t get another until 2000 points, and then another (armor skin) at 3000, and so on. You only have one skin in your unlocked skins window. So, yeah.
Your screenshot only shows you have not yet unlocked the 2000 AP Chest, nor the 2500 AP Chest.
You may have been confused about your previous AP total, or I am missing something in the screenshots.