A Dark Iron Past

Little yellow glowing orbs that pop up after bosses or notable trash mobs die. Click them and some RP will happen. Anyone can click them and everyone will get credit. They also seem to respawn in about 10 seconds so if you were outside the raid and missed one you can click it again. You may also be able to walk into a full cleared raid and click them all, but I'm not able to confirm that. Can get them in LFR for sure, and presumably Normal and Heroic as well. They do not spawn in the sections of other LFR wings when you complete one.

LFR Wing 1 - The Elemental Overlords
Detention Block - Lord Roccor
Twilight's Hammer - High Interrogator Gerstahn
The Dark Iron Highway - Bael'Gar
Lords of the Firelands - Lord Incendius

LFR Wing 2 - Shadowforge City
Shadowforge City - Fineous Darkvire (after his room, out the door to the right)
Martial Law - The room past the Black Vault orb in the same hallway after Fineous' room.
The Grim Guzzler - Phalanx (Grim Guzzler room)
The Black Vault - In the Black Vault, left after Fineous' room. Lots of trash but you can just click it and die.
Dark Iron Nobles - Room before Golem Lord Argelmach
The Summoning - The Seven
The Lyceum - General Angerforge

LFR Wing 3 - The Imperial Seat
The Servant Emperor - Emperor Dagran Thaurissan
End of an Empire - Ambassador Flamelash

if you are more comfortable with using maps:

Map: The Elemental Overlords
(44 77) [npc=233085]
(30 56) [npc=233102]
(35 57) [npc=233100]
(46 44) [npc=233104]

Map: Shadowforge City
(57 56) [npc=233106]
(52 60) [npc=233110]
(53 44) [npc=233114]
(62 11) [npc=233118]
(51 67) [npc=233108]
(59 65) [npc=233112]
(56 23) [npc=233116]
(70 11) [npc=233120]

Map: The Imperial Seat
(81 10) [npc=233122]

Achieve is not obtainable in LFR due to the fact that "The Servant of the Emperor" orb doesn't spawn. Most likely a bug. It is currently only spawning on norm and heroic.

Edit: This has been fixed and is now obtainable in LFR.