Elusive Foes: Argus

An easy way to work on this achievement is to complete rare elite world quests in Argus. They will have a single kill target as the objective and a dragon around the world quest icon. In addition to easily seeing where they are located on the map, they will always have fast respawn times.

25 rares are needed for Elusive Foes: Argus, which is part of [achievement=42567]

Antoran Wastes

/way #885 65.5, 26.6 Mother Rosula (entrance)
/way #885 60.9, 22.9 Chief Alchemist Munculus
/way #885 61.7, 37.2 Blistermaw
/way #885 77.4, 74.9 Squadron Commander Vishax (Portal)
/way #885 53.1 35.8 Vrax'thul
/way #885 65.6 26.6 Puscilla (entrance)
/way #885 63.1 25.2 Houndmaster Kerrax (entrance)
/way #885 52.7 29.5 Watcher Aival
/way #885 73.2 70.8 Admiral Rel'var
/way #885 75.6 56.5 All-Seer Xanarian
/way #885 64.3 48.2 Varga
/way #885 50.9 55.3 Worldsplitter Skuul
/way #885 56.2 45.5 Gar'zoth
/way #885 57.4 32.9 Mistress Il'thendra (inside building)
/way #885 54.7 39.1 The Many-Faced Devourer (spot to summon)
/way #885 58.1 12.4 Doomcaster Suprax (runes)
/way #885 65.4 81.5 Rezira the Seer (portal)
/way #885 66.0 54.1 Ven'orn
/way #885 61.9 64.3 Wrath-Lord Yarez
/way #885 55.7 21.9 Void Warden Valsuran
/way #885 62.4 53.8 Lieutenant Xakaar
/way #885 80.5 62.8 Commander Texlaz (portal)
/way #885 61.1 45.7 Inquisitor Vethroz (path start)

[npc=127705] - collect 100 [item=152999] from [npc=126073] and make [item=153013]. Use the fest in the cave near fel pool.
[npc=127703] - three players need to stand on all three runes to summon him
[npc=127706] - complete [quest=49200] to get [item=153226]. When you use it, it opens a portal to her (party members can use it)
[npc=127700] - collect [item=152941], [item=152940] and [item=152891] from [npc=127597] and [npc=127596] + [item=152890] from [npc=127598]. Combine it to get Commander on Deck!
[npc=127581] - collect [item=152786] from [npc=126193] and [npc=126171]. Collect [item=152991], [item=152992] and [item=152993]. After that summon [npc=127581] at the Bone Effigy

Eredath

/way #882 55.7 59.9 Wrangler Kravos
/way #882 43.8 60.2 Baruut the Bloodthirsty
/way #882 36.3 23.6 Vigilant Thanos
/way #882 33.7 47.5 Venomtail Skyfin
/way #882 27.2 29.8 Captain Faruq
/way #882 30.3 40.4 Ataxon
/way #882 35.5 58.7 Herald of Chaos (2nd floor)
/way #882 48.5 40.9 Jed'hin Champion Vorusk
/way #882 58.0 30.9 Overseer Y'Sorna
/way #882 61.4 50.2 Instructor Tarahna
/way #882 56.8 14.5 Commander Xethgar
/way #882 49.5 52.8 Slithon the Last
/way #882 44.6 71.6 Shadowcaster Voruun
/way #882 65.3 67.5 Soultwisted Monstrosity
/way #882 38.7 55.8 Kaara the Pale
/way #882 41.3 11.6 Feasel the Muffin Thief
/way #882 63.8 64.6 Vigilant Kuro
/way #882 39.2 66.6 Turek the Lucid
/way #882 35.2 37.2 Umbraliss
/way #882 70.4 46.7 Sorolis the Ill-Fated
/way #882 44.2 49.8 Sabuul
/way #882 59.2 37.7 Overseer Y'Beda
/way #882 60.4 29.7 Overseer Y'Morna
/way #882 64.0 29.5 Zul'tan the Numerous
/way #882 49.7 9.9 Skreeg the Devourer

Krokuun

/way #830 55.5, 80.2 Talestra the Vile
/way #830 58.0, 74.8 Siegemaster Voraan
/way #830 69.6, 57.5 Tereck the Selector
/way #830 69.7 80.5 Tar Spitter
/way #830 70.5 33.7 Naroua
/way #830 42.0 57.1 Commander Vecaya (path up)
/way #830 53.4 30.9 Sister Subversia
/way #830 60.8 20.8 Vagath the Betrayed
/way #830 41.7 70.2 Imp Mother Laglath
/way #830 50.3 17.3 Khazaduum (entrance)
/way #830 33.0 76.0 Commander Sathrenael
/way #830 44.5 58.7 Commander Endaxis

Just me or is 25 a bit silly..? Others are usually 5.