What A Strange, Interdimensional Trip It's Been

Bosses in 5 Man Dundeons

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• Gug'rokk = Last boss in [zone=6874]
  [npc=83612] = Last boss in [zone=6951]
  [npc=77120] = Last boss in [zone=7307]
  [npc=83846] = Last boss in [zone=7109]
  [npc=80005] = Last boss in [zone=6984]
  [npc=76266] = Last boss in [zone=6988]
  [npc=76407] = Last boss in [zone=6932]
  Teron'gor = Last boss in [zone=6912]
  
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Bosses in Raids

[zone=6996]

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• Kargath Bladefist / [npc=77404] / [npc=78491] in First Wing (Walled City)
  [npc=78948] / [npc=78238] / [npc=79015] in 2nd Wing (Arcane Sanctum)
  [npc=77428] in 3rd Wing (Imperator's Rise)
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[zone=6967]

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• [npc=77182] / [npc=76877] / [npc=76806] aka Blast Furnace in First Wing (Slagworks)
  [npc=76973] / [npc=76814] / [npc=77692] in 2nd Wing (The Black Forge)
  [npc=76865] / [npc=76906] / [npc=77557] aka The Iron Maidens in 3rd Wing (Iron Assembly)
  Blackhand in 4th Wing (Blackhand's Crucible)
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Outdoor / World Bosses

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• Tarlna the Ageless / Drov the Ruiner in Gorgrond
  Rukhmar in Spires of Arak
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Happy Hunting !

Edit:- Fixed a wrong link, thanks Cadoman!

[npc=86470] can be found:

Alliance:

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• Level 1 Garrison: In the tree to the left of the tent (looking towards tent) with your command table in it.
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• Level 2 Garrison: In the tree directly behind the flight path.
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• Level 3 Garrison: In the tree between Large Plot 1 and Medium Plot 2 (two northernmost large and medium buildings to the right of your Town Hall if you are looking at it).
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Horde:

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• Level 1 Garrison: In the tree to the east of your Garrison behind the fortification (outside the wall). - Thanks Solithan
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• Level 2 Garrison: Large tree behind the flightpath and to the left (looking towards hall) of your town hall.
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• Level 3 Garrison: To the right (looking towards hall) of your town hall in a smaller tree overlooking your small buildings.
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To get [npc=86470] you will need to click on him while jumping or, target him and use your interact-with-target keybind while jumping.

The cute little bird gives you a buff, [spell=172762] that will last for 60 minutes or until you die so you will need to kill all of these bosses without dying though it will likely be possible to complete the raid ones in LFR without too much trouble. He has a short ~10 minute respawn but you can force a respawn by reloading your garrison which you can do easily by queueing for proving grounds and leaving.

This achievement will award the [item=122293] which is a toy that will pop Pepe on your head for 60 mins, wherever you are, on any of your alts and with only a 60 second cooldown! Pepe for all!

It's worth noting that normal instance kills count for the bosses, they don't have to be on heroic.