This achievement is gained upon collecting the following Overseer Agents.

Advocate of Brell
Barbed Bone Skeleton
Captive Elemental
Crystallos Stone Trader
Dark Reflection Poisoner
Darkvine Entrancer
Darkvine Thistle
Deathspore Decomposer
Dwarven Trinket Seller
Elder Spirit Guide
Emissary of Crystallos
Enraged Dwarf Skeleton
Faerie Courtier
Fallen Noble
Feir'Dal Salvager
Felwithe Songwhisperer
Firstlight Refugee
Forest Gatherer
Impetuous Rover
Inquisitive Wanderer
Junk Dealer
Kelethin Lorist
Kirathas Druid
Kirathas Villager
Koada'Dal Alchemist
Koada'Dal Counselor
Orc Emissary
Orc Slavers
Shadowy Scrivener
Sneering Gargoyle
Steam Trader
Steam Zealot
Treasure Seeker
Tunarian Scout
Undead Barkeep
Wandering Tinker

Hidden Steps

• Overseer Unlocked on Server