Just an Ordinary Gas Cloud

This achievement requires you to use the [item=23821] - a crafted item from The Burning Crusade - to suck 50 gas clouds.

You can purchase [item=23821] on the Auction House or craft one yourself by learning the pattern from [item=23888], rewarded from the quest The Zapthrottle Mote Extractor! (A) / The Zapthrottle Mote Extractor! (H).

These clouds can be found throughout Outland or Northrend. They are similar mechanics to herbs or ore nodes.

Here's some maps of potential spawns locations - there are probably more than this but use it as a general guide. Note these are from comments written in 2008/9.

Outland

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• Nagrand (Windy Cloud Air): [url=http://www.wowhead.com/?maps=3518:440460620761690700690570520300500380520491331431319466281580426784461590480250430471351803654504270611560450358287654737550801682625542233658563216330343267250423301590299621485667576772247295224512363248705431625392571477641462519217384310418240275361299330356392299652371807470699586629700512599427488283511252415299470559426267537508446753646613661664516815586730602784604710322629490306312260470376335396426528550644669772617644643582672582687656718664718691579260239761]Map
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• Netherstorm (Arcane Vortex Mana): [url=http://www.wowhead.com/?maps=3523:568330401619430751518600531871643580699440332652200660250419490182332601273586301380457252231768384765408687724396610372591341410524420566516532553582617633617582654594633601459178395318537267646365581803405166410256607345659306721353579458630485664516511559306407309434296532340543281792319722]Map
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• Shadowmoon Valley (Felmist Shadow): [url=http://www.wowhead.com/?maps=3520:614587566363509520568460466470485207522210620211384419363370642466651304363491573743651363607479467521471535581455495330420426214327533341349344622631649612466378430490560540300450620374542506450380350450280360431729570190328378342412391277593675463586591368441621]Map
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• Zangarmarsh (Swamp Gas Water): [url=http://www.wowhead.com/?maps=3521:090510280240300210310320320380340420380600450560630660750830780790850490712442720341119609129438712679829730251279769881159198325306237555301504459586586349579516607555651730844312601530331619160242269359272433186685282479867456603464673658650685808790435533388522414584401623383631199316119460787464696580761398629405481312398363373359354390360460266386264308165600544553531666803821]Map
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Northrend

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• Arctic Cloud: Crystallized Air + Crystallized Water
  seen in: Howling Fjords, Dragonblight, Storm Peaks (pinned map)
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• Cinder Cloud: Crystallized Fire
  seen in: Dragonblight, Sholazar Basin (pinned map)
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• Steam Cloud: Crystallized Water + Crystallized Fire
  seen in: Borean Tundra (pinned map), Sholazar Basin (pinned map)
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It took about 1.5 hour to get all 50 using this route:

Start with Warmode on and start with Nagrand from Shattrath.
Nagrand start: https://i.imgur.com/hhQN7ey.jpg
You then fly over Throne of the elements from Nagrand into Zangarmarsh (Don't miss the fire/air elemental spot on the right side of Throne of Elements)
Zangarmarsh Finish: https://i.imgur.com/7oJGZco.png
You then reach Zabra'jin where you will disable warmode, and continue into nagrand and then back into Zabrajin after a full lap.
Use [item=140192] to get to Org fast to enable warmode again and start over.

Tip: Move your Mini map to the right of your character in the middle of the screen to make it easier to spot them and Enlarge the minimap.
Stay in the open.

Download Gathermate2 and Gathermate2 Gas Clouds from curseforge. Import gas clouds in the import tab (menu, options, addons, gathermate2/import)

Fly around sholazar basin, get achievement