How to add achievement?

[jaunty river]

How can I add my own achievement, is it possible, if so, I would like to get explanation of what is responsible for what. thanks in advance

[sour shale]

Once your ticket has been resolved, please close it with </ticket close:1054771505520717835> command!

[tribal cosmos]

this is done in a datapack

im sure if you look up on youtube 'how to make custom achievements" youll get a guide for it

[sour shale]

Ticket closed!