From Halopedia, the Halo wiki
The Achilles suit's neural interface is equipped with a savage AI that gnaws at the mind of its user, easily leading to excessive violence in combat.
Only select Spartans who have mastered themselves are allowed to requisition the Achilles set, as unskilled wearers will quickly lose themselves to uncontrolled rage at the hands of the suit's embedded AI.
Halo 5: Guardians
Achilles was added into Halo 5: Guardians in the Infinity's Armory update. It is unique among the Halo 5 armor sets in that it is one of the few that can only be unlocked via specific in-game achievements, as opposed to the requisition system.
|The AI that lies within the branching lattice of the ACHILLES' neural interface gnaws at the mind of its partner. No Spartan can stand alone against its urgings of unbridled excess, but through bonds of loyalty and duty they can be held at bay.||Achieve level 3 in all of the Spartan Company Mastery Commendations' Kill Commendations|
|Only Spartans who have mastered themselves, bound their wrath and passion within a shell of hyperdense steel fueled by starfire, are granted access to the ACHILLES. Lesser warriors will lose themselves in a storm of blood.||Achieve level 5 in all of the Spartan Company Mastery Commendations' Kill Commendations|
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Achilles was known internally as "A102_S000 Waypoint Companies Armor" during development. The armor was initially accidentally unveiled with the Cartographer's Gift update, when some glitched REQ cards were available to view with the Achilles name - though only placeholder imagery.
|Browse more images in this article's gallery page.|
Concept art and Artwork
A Spartan-IV wearing the Achilles armor on Empire.
List of appearances