What is an achievement that is very unlikely, or just straight up not going to get before the next expansion?
I’m not going to make it, unless something drastic happens, to 1600 pets.
I’m about 50 pets short, and just gated by RNG drops. Even IF I were to get all the ones I’m currently farming, it would take a miracle to make it, and there is only so much farming you can do. 
Collecting the season one pvp ensemble for Dragon Flight. As soon as season one starts for The War Within I can use Marks of Honor to buy it.
I have put off doing the Last Glory meta - Dragonflight dungeons for some vague reason. Tons of easy points. Probably get it done season one.
At this point… Taking from nature. I’ve needed Tyrhold only for Taivan for the last month plus, without it spawning… It’s all RNG.
“Better to be Lucky Than Dead” in The Maw because of the group summon needed for four of the rares on the kill list.
For me it would have to be Draenor Curator. I’ve been trying to get my last (2) Pristine Artifacts over time, But RNG is not in my favor.
Created multiple copies of the (2) artifacts I need, But they refuse to turn into Pristine’s for me.
Update:
I got to 1600.
Took some good RNG and the AH, but I got it!
Grats!
thank you very much!!