Game:

Black Mesa (2020)

Duration: 0:00

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In order to unlock the Contest Propellant achievement, get to (or start) Chapter 17, Interloper. Once you are in Chapter 17, proceed until you have a fight with the first Controllers in the game. This is where you drop down from a vent to a small room with a supply drop and a console with a green button.

Finish the fight, and once it is over, crouch walk through the vent on the ground level. Once you are through the vent, look to the left to notice 2 crates blocking a doorway. Break the crates and follow the path up to a small room. When you walk into the small room at the end of the path, a supply droop will spawn in, and the achievement will unlock!

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