Court is Now in Session

Very strange to see an achievement like this. You are required to obtain 2 pets from Dragonflight sources, 1 from the Dragonflight Family Battle Meta. The 4th pet requires 2000 pets which doesn't seem likely to be possible for anyone until 12.0 or thereabouts, long after the end of Dragonflight.

okey ppl. Wnen patch 11.0.5 is a live, we nave a new achievment : collect 1800 pets.
Reward from this achievment is a Mister Muskoxeles.
This is a hard part.
Lord Basilton is a quest reward from Carry On, Basilton quest in Thaldraszus
Mister Toots is a quest reward from So How Did It Go? quest in The Waking Shores
Lady Feathersworth is a pet from achievment Family Battler of the Dragon Isles
Princess Vorquistrasza is a quest from A Cavalier Pet quest in Valdrakken
I think the hard part is a collect 1800 pets. I have 1610. and not complete all Dragonflight stuff..
Happy hunting ...

This achievement and the associated rewards pet has been removed from the game a week or so after the launch of Dragonflight along with the achievement Good Things Come in Small Packages. This may be readded back in a future patch.