I have completed this grind quite some time ago, and i think it's rather pretty rare to obtain all 4 of those. (yes im aware that the 2 oldschool ones are removed)
And it totally bugs me out that both the old ones give a feat of strenght and both new ones give nothing.
Sure it's just pointless achievements .. but i love feats of strenghts :P
Maybye introduce a special one with a title to reward those who truely farmed both versions of Zull Gurub and got all 4 ?
Also is there a way to check how many other people in wow have completed this ? i think this is pretty rare. (only have met 3 others ingame who had them all 4 also)
Anyway here's a screenshot of the 4 mounts, oldschool tiger still remains my favorite mount in wow, and allways will
Inb4 special snowflake comments .. This took me insanely long to farm, and i had to get insane RNG luck. Especially on the older ones.
I started soloing vanilla ZG somewhere during the end of the first tier of Wotlk as a Prot palla tank and basicly did it every 3 day reset from then on till i got both of them. ( They dropped quite fast after eachother, must been somewhere around 70-80 runs)
The newer ones where much more of a joke to get, you could run this ZG version each day 1x and even in Cata during the DS patch you could allready 2-3 man it. So i just formed a core group with friends and we kept running it till we all got those.
Good luck to the collectors