When I get advancement "Obtain Armor" and "Shiny Gear", a notification appears at the top. But it appears every time I do another piece of armor, even if I have already made the advancement.
Example : I make an iron helmet and a notification "Advancement Made !" appears and the advancement was done. Then I make an iron chestplate and the notification appears again... I make a iron leggings and boots and the notification appears again !!
So.. look the screenshots