Hardcore Mythical Defender is an achievement that is unlocked by completing all levels of the original campaign (from The Deeper Well to Glitterhelm Caverns) on Nightmare difficulty with Hardcore mode on.

Obtaining this achievement awards the player the Aperture Science HPD Mk2 upon returning to their own Tavern, provided you bought the game from Steam (i.e. already own/owned the ASHPD).

Related Achievements

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