Advancement+ is a Minecraft mod for Fabric 1.21.8. It might also be compatible with 1.21.9 and 1.21.10, but I haven't so just use it for 1.21.8. Advancement+ adds more advancements to the game to give you a challenge that you honestly don't need. Some of the advancements involve getting a bunch of gold items and one involves reaching Y level 5000. Theres no way you get the Y level one.