Well, i tought it was impossible to get the 100 mounts achievement so i made a list(Alliance).
This list includes all mounts you can still obtain, at the end of this post i will list the removed/unobtainable mounts.
As you can see it is possible to obtain over 100 mounts but this includes a lot of rare mounts and/or hard to get archievements.


Darnassus exalted - 6 Mounts

1 - Reins of the Swift Frostsaber 100G
2 - Reins of the Swift Mistsaber 100G
3 - Reins of the Swift Stormsaber 100G
4 - Reins of the Spotted Frostsaber 10G
5 - Reins of the Striped Frostsaber 10G
6 - Reins of the Striped Nightsaber 10G

Ironforge exalted - 6 Mounts

7 - Swift Brown Ram 100G
8 - Swift Gray Ram 100G
9 - Swift White Ram 100G
10 - Brown Ram 10G
11 - Gray Ram 10G
12 - White ram 10G

Stormwind exalted - 7 Mounts

13 - Swift Brown Steed 100G
14 - Swift Palomino 100G
15 - Swift White Steed 100G
16 - Brown Horse Bridle 10G
17 - Chestnut Mare Bridle 10G
18 - Pinto Bridle 10G
19 - Black Stallion Bridle 10G

Exodar exalted - 6 Mounts

20 - Great Blue Elekk 100G
21 - Great Green Elekk 100G
22 - Great Purple Elekk 100G
23 - Brown Elekk 10G
24 - Gray Elekk 10G
26 - Purple Elekk 10G

Gnomeregan Exiles exalted - 7 Mounts

26 - Swift Green Mechanostrider 100G
27 - Swift White Mechanostrider 100G
28 - Swift Yellow Mechanostrider 100G
29 - Blue Mechanostrider 10G
30 - Green Mechanostrider 10G
31 - Red Mechanostrider 10G
32 - Unpainted Mechanostrider 10G

Wintersaber Trainers exalted - 1 Mount

33 - Reins of the Winterspring Frostsaber 100G

Kurenai exalted - 8 Mounts

34 - Reins of the Cobalt War Talbuk 100G
35 - Reins of the Cobalt Riding Talbuk 70G
36 - Reins of the Silver War Talbuk 100G
37 - Reins of the Silver Riding Talbuk 70G
38 - Reins of the Tan Riding Talbuk 70G
39 - Reins of the Tan War Talbuk 100G
40 - Reins of the White Riding Talbuk 70G
41 - Reins of the White War Talbuk 100G

Sha'tari Skyguard exalted - 5 Mounts

42 - Blue Riding Nether Ray 200G
43 - Green Riding Nether Ray 200G
44 - Purple Riding Nether Ray 200G
45 - Red Riding Nether Ray 200G
46 - Silver Riding Nether Ray 200G

Netherwing exalted - 6 Mounts

47 - Reins of the Azure Netherwing Drake 200G
48 - Reins of the Cobalt Netherwing Drake 200G
49 - Reins of the Onyx Netherwing Drake 200G
50 - Reins of the Purple Netherwing Drake 200G
51 - Reins of the Veridian Netherwing Drake 200G
52 - Reins of the Violet Netherwing Drake 200G

Grypon vendor in Shadowmoon Valley - 7 Mounts

53 - Swift Blue Gryphon 200G
54 - Swift Green Gryphon 200G
55 - Swift Purple Gryphonnn Flamebeard 200G
56 - Swift Red Gryphon 200G
57 - Ebon Gryphon 100G
58 - Golden Gryphon 100G
59 - Snowy Gryphon 100G

Cenarion Expedition exalted - 1 Mount

60 - Cenarion War Hippogryph 1600G

The Sons of Hodir revered - 1 Mount, exalted - 1 Mount

61 - Reins of the Ice Mammoth 800G
62 - Reins of the Grand Ice Mammoth 8000G

Wyrmrest Accord exalted - 1 Mount

63 - Reins of the Red Drake 1600G

Mei Francis (neutral Kirin Tor faction) - 4 Mounts

64 - Armored Snowy Gryphon 2000G
65 - Reins of the Armored Brown Bear 750G
66 - Reins of the Traveler's Tundra Mammoth 20000G
67 - Reins of the Wooly Mammoth 200 Emblem of Herois, no discount for exalted

PVP Mounts - 9 Mounts

68 - Black Battlestrider 30 BG marks of WG/AB/AV
69 - Black War Ram 30 BG marks of WG/AB/AV
70 - Black War Steed Bridle 30 BG marks of WG/AB/AV
71 - Reins of the Black War Elekk 30 BG marks of WG/AB/AV
72 - Reins of the Black War Tiger 30 BG marks of WG/AB/AV
73 - Stormpike Battle Charger 50 AV marks
74 - Reins of the Dark Riding Talbuk 70 Halaa Battle Tokens, 15 Halaa Research Token
75 - Reins of the Dark War Talbuk 100 Halaa Battle Tokens, 20 Halaa Research Token
76 - Reins of the Black War Mammoth 300 Stone Keepers Shards

Craftable mounts - 5 Mounts

77 - Mekgineer's Chopper Engineering
78 - Flying Machine Control Engineering only
79 - Turbo-Charged Flying Machine Control Engineering only
80 - Flying Carpet Tailoring only
81 - Magnificent Flying Carpet Tailoring only

Achievement mounts - 7 Mounts

82 - Reins of the Black War Bear Complete For the Alliance
83 - Reins of the Albino Drake Complete Leading the Cavalry
84 - Reins of the Violet Proto-Drake Complete What A Long, Strange Trip It's Been
85 - Blue Dragonhawk Complete Mountain o' Mounts
86 - Reins of the Red Proto-Drake Complete Glory of the Hero
87 - Reins of the Rusted Proto-Drake Complete Glory of the Ulduar Raider
88 - Reins of the ironbound Proto-Drake Complete Heroic: Glory of the Ulduar Raider

Drops - 20 Mounts

89 - Swift Zulian Tiger Rare drop from High Priest Thekal - Zul'Gerub
90 - Swift Razzashi Raptor Rare drop from Bloodlord Mandokir - Zul'Gerub
91 - Deathcharger's Reins Rare drop from Baron Rivendare - Stratholme
92 - Blue Qiraji Resonating Crystal Common drop from Trash - Temple of Ahn'Qiraj
93 - Green Qiraji Resonating Crystal Common drop from Trash - Temple of Ahn'Qiraj
94 - Red Qiraji Resonating Crystal Rare drop from Trash - Temple of Ahn'Qiraj
95 - Yellow Qiraji Resonating Crystal Common drop from Trash - Temple of Ahn'Qiraj
96 - Swift White Hawkstrider Rare drop from Kael'thas Sunstrider - Magisters' Terrace Heroic
97 - Reins of the Raven Lord Rare drop from Anzu - Sethekk Halls Heroic
98 - Fiery Warhorse's Reins Rare drop from Attumen the Huntsman - Karazhan
99 - Reins of the White Polar Bear Rare drop from Hyldnir Spoils - reward from Gretta the Arbiter's daily quests in Stormpeaks
100 - Grand Black War Mammoth Rare drop from Archavon - Vault of Archavon (opens when you win wintergasp)
101 - Ashes of Al'ar Rare drop from Kael'thas Sunstrider - The Eye
102 - Reins of the Green Proto-Drake Rare drop from Mysterious Egg - Revered with The Oracles to buy it (rare drop from the egg)
103 - Reins of the Blue Proto-Drake Rare drop from Skadi the Ruthless - Utgarde Pinacle
104 - Reins of the Time-Lost Proto-Drake 100% drop Time-Lost Proto-Drake(rare) - Stormpeaks
105 - Reins of the Bronze Drake 100% drop Infinite Corruptor - The Culling of Stratholme Heroic (kill all but the last boss within 25 min for spawn)
106 - Reins of the Black Drake 100% drop from Sarthaion - The Obsidian Sanctum (kill Sarthaion with all 3 mini drakes still alive)
107 - Reins of the Twilight Drake 100% drop Sarthaion - The Obsidian Sanctum Heroic (kill Sarthaion with all 3 mini drakes still alive)
108 - Reins of the Blue Drake Rare drop from Alexstrasza's Gift - The Eye of Eternity
109 - Reins of the Azure Drake Rare drop from Alexstrasza's Gift - The Eye of Eternity Heroic
110 - Sea Turtle Rare drop from any northend fishingpool

Seasonal drops - 3 Mounts

111 - The Horseman's Reins The Headless Horseman - Scarlet Monastery Graveyard
112 - Great Brewfest Kodo Coren Direbrew - The Black Rock Depths
113 - Swift Brewfest Ram Coren Direbrew - The Black Rock Depths

Recruit a friend - 1 Mount

114 - Swift Zhevra use the recruit a friend option in account management and recruit a friend for 2 months

Argent Tournament - 6 Mounts

115 - Great Azuremyst Elekk
116 - Swift Ironforge Ram
117 - Turbostrider
118 - Swift Darnassian Mistsaber
119 - Swift Elwynn Steed
120 - Argent Hippogryph

WoW Trading Card Game - 6 mounts

121 - Riding Turtle no Ridingskill
122 - Reins of the Spectral Tiger 60 Ridingskill
123 - Reins of the Swift Spectral Tiger 100 Ridingskill
124 - Big Battle Bear 100 Riding skill
125 - X-51 Nether-Rocket 225 Ridingskill
126 - X-51 Nether-Rocket X-TREME 300 Ridingskill

Unobtainable/removed mounts

Black Qiraji Resonating Crystal - open the AQ gates (Still obtainable when a new server opens)
Plagued Proto-Drake
Black Proto-Drake
Swift Nether Drake
Merciless Nether Drake
Vengeful Nether Drake
Brutal Nether Drake
Amani War Bear
Brewfest Ram
any old school mount

on order to get all these mounts you have to be a gnome/dwarf with engineering + tailoring :)
mechanostriders can only be bought by gnomes or dwarfs :(

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Q u o t e:
on order to get all these mounts you have to be a gnome/dwarf with engineering + tailoring :)
mechanostriders can only be bought by gnomes or dwarfs :(

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Not as of the latest patch, the racial requirements on Mechanostriders has been removed.

serieusly??

cool :D going to get one this afternoon ^^

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Q u o t e:


Not as of the latest patch, the racial requirements on Mechanostriders has been removed.

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Wrong..

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Q u o t e:
Not as of the latest patch, the racial requirements on Mechanostriders has been removed.

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Wrong, will be removed when 3.0.8 hits, they still are gnome / dwarf only as of now.

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Q u o t e:


Wrong..

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No, correct.


Oh oh, latest patch.

/goes train his Reading skill

Hmm, I thought that there is 8 Kurenai Mounts.

Yea, you're right i've overlooked 2 of them, i'll edit it right away.
I wish i've forgotten a lot more of them so this upcomming archievement is a little bit easyer to get as it is right now......

So unless i counted wrong you need 14 drop mounts that is really a pain

nope, you will need 12 drop mounts, if you get both the tailoring and engineering mounts, otherwise you'll need 16 of them unless you want to complete it within a year then you need 17 drops since the archievement What A Long, Strange Trip It's Been takes a minimum of 1 year to complete

There is 1 more mount I could think of, I obtained it today.

The White Polar Bear mount.
You can get it in Stormpeaks, do the dailey quests in brunnhildar village, you get a "Hyldnir Spoils" everytime, and that Item has a small chance of containing the Polar bear mount.

the cost of all the buyable mounts would be 31k g ;)

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Q u o t e:
There is 1 more mount I could think of, I obtained it today.

The White Polar Bear mount.
You can get it in Stormpeaks, do the dailey quests in brunnhildar village, you get a "Hyldnir Spoils" everytime, and that Item has a small chance of containing the Polar bear mount.

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mount nr 98 :)

i know it's a long list but it was already there

The list seems to be missing the Grand Black War Mammoth.
Supposedly a rare drop from Archavon on either Heroic or Normal.

Big money sink coming your way, only 99.99$

didnt they reduce it to 50?

You're thinking of Calling the Calvary for the Albino drake (Which incidentlly used to be 75 before dropped to 50 for eaiser on us cows). this is for the Mountain of Mounts achievement that gets two Dragonhawks, a red one and a blue... The black un is a mystrey.

Fabulous for Taurens...

My gawd, I'd love a frigging Dragonhawk...
Darn you Blizzard ._.

Ignore me <3
That Pink Hawkstrider shall be mine!