Albino Drake

Now only takes 50 mounts, much more reasonable! :)

http://wotlk.wowhead.com/?achievement=2143 Is the new 50-mount confirmed achievement with this reward.

The letter from Mei Francis that you recieve with the mount says:

I couldn't help but notice how good you are with the livestock. With all of the activity around here, business has been better than ever for me.

I don't suppose you'd mind looking after this Albino Drake for me? I simply don't have enough spare minutes in the day to care for all of these animals.

Yours

Mei

Harder for a tauren imo. You only get 6 wolves (org rep) 5 kodos (tb) 4 PVP mounts (incl. frostwolf howler), 8 talbuks (maghar).

That amounts to 23 mounts, with 18 (7 hawkstriders, 6 raptors and 5 skeletal horses) unusable rep mounts.

Flying mount wise,3 normal flying windriders, 4 epic flying windriders, 5 nether rays, 6 nether drakes, 1 hippogryph.

Thats 19 flying mounts, total of 42 mounts.

The last 8 must come from
professions:
Engineering: 2 flying machines both epic and normal, 1 bike(wotlk only)
Tailoring: 2 Flying carpets, epic and normal(wotlk only)

1 Armored Brown Bear (wotlk only)
1 snow gryphon/blue armored windrider (wotlk only)
1 Armored Black Bear (Achievement; kill leaders of cities)
1 Armored War Mammoth (wotlk only)
2 Black War Talbuk/Riding Talbuk (pvp marks, halaa)

Up to here its 10 mounts assuming both tailoring and engineering is taken up and halaa pvp is actually viable.
Other sources include:
2 Brewfest mounts
1 Hallows End Horse
1 Attumen Steed
1 Ashes of Alar
1 White Warstrider (Hmgt)
1 Anzu (Hsettek)
1 Baron mount
1 zg tiger
1 zg raptor
4 Arena drakes
6 drakes (Eye of Eternity,Obsidian Sanctum,CoT Stratholme,rep)( wotlk only)
- Azure 25 man Eye of Eternity
- Blue 10 man Eye of Eternity
-Black 10 man Obsidian Sanctum
- Twilight 25 man Obsidian Sanctum
- Bronze H Culling of Stratholme beat the timer loot
- Red Wyrmrest Accord Exalted
7 Proto-dragon mounts (wotlk only)
- Time-Lost rare mob
- Blue H Utgarde Pinnacle
- 1 egg from sholazar basin. rare.
- 4 more from achievements
2 spectral tiger
2 rocket mount
1 turtle
1 deathknight flying mount,Ebon blade rep(deathknight only)
1 deathknight land mount (free)(deathknight only)

I am not sure if the brooms are counted now that you can learn them as a spell, maybe the timer gets removed.
edit:drakes now available via vendor,thx for the tip *goes buying*