Game:

Black Mesa (2020)

Duration: 0:00

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In order to unlock the Permeable Infrastructure achievement, you need to use an alternate path in the 4th Chapter, Office Complex. Once you get to Chapter 4, play through the level until you run into a Security Guard that will join you. You will need to then head through some offices. At some point, you will hear a lady screaming for help, and 3 Vorts will spawn.

Kill the Vorts, and once they are dead, you want to head into the small room with couches and a ladder leading into the ceiling. This room is straight across from where you entered the area before the Vorts spawned. Trying to climb the ladder will not work because the ceiling tiles are in the way. Break the ceiling tiles, climb the ladder, and follow the path. The achievement will unlock shortly after getting into the vent!

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