Describe the solution you'd like
A perk that can be configured to create and grant an achievement.

Why is this feature needed
Saw someone asking for it in ?questions, figured it would be a candidate for a perk.

Achievements have to be created in data. given that we don't want to be reloading data on behalf of the server ops, I think this is captured via the command perk?

/achievement only awards existing ones. I take it creating new ones is not possible at this point in the data load?

Perks run during the game, so well after data is loaded. If the suggestion is to have the perk create the advancement as the server is loading, then that's certainly doable, but wooo is that a doozy of work.

I doubt this is urgent in any way, shape, or form. Either back-burner it or just drop it. /achievement can be easily used to award achievements.

I think making advancements via perks is going to be too complex for users to configure or just be too limited. Since we use datapacks for configs anyways, they can create their advancements there and invoke them with the command perk.