This is achieved fairly early on in the game, the Section F story mission pertains to the sealed off Nazi infested section of Eva's Hammer no one on ship seemed to have known about. The mission is pretty straight forward.
Here's a few visual references.
The first is by YouTuber "DXS" and it shows just about where the achievement should pop.
This second video is by YouTuber "RockHardGamer 45" and it shows a rough full playthrough of this mission.