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How does one obtain these achievements in Black Mesa: Source?

Taken from enter link description here Quantum Capacitance: Overcharge it anyway. Remote Detonation: Kill a Barnacle with a Satchel. Unified Coupling Theorum: Help the Barnacle and ...
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1answer
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Black Mesa achievements

What are the achievements in the new Half-Life 2 mod Black Mesa?
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How do I get the “Ethically Questionable” achievement in Black Mesa?

I've almost completed Chapter 3 "Unforeseen Consequences" and haven't seen anything which looks like it could be related to this achievement. What do I need to do in order to unlock this achievement?