|| Complete any mission on Brutal difficulty with Onslaught and Hardcore Friendly Fire enabled.
Hardcore is a Steam Achievement that requires you to complete any mission in the Jacob's Rest campaign on Brutal difficulty, with Onslaught mode and Hardcore Friendly Fire enabled.
- This is currently the most difficult achievement in the game.
- It is best to attempt this achievement with a squad of veteran players who all are comfortable with insane or brutal difficulty.
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