Quote Originally Posted by Halivel View Post
You don't. They send you a special item trough Moogle Post after ranking is done, using which unlocks (basically places) a special achievement unto your achievments list. The same way you can't see achievements for seasonal events you didn't participate in - they simply do not exist for you.

As for the DevTeam's decision - I'm perfectly fine by this and it's honestly pretty much what I was hoping for.
Oh wait you may be right, if I can't consume the mail item for the next achievement T.T Regardless will do it unless SE confirm I can't