How do I get the "Tactical Genius" achievement in Relics 1?

I somehow got it first try on my first playthrough but I can’t remember how I did, does anyone know how to get it?

What I usually do is bring up the spotlight to the walls, same with the machine gun, and then with high gunplay, appoint snipers

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Floodlight, Dig trap, Place snipers and Responsive or Go melee.