A reference to the original Gears of War title, this can be unlocked in a Private match too, provided you own the map Security, by either buying it or buying the season pass. If you don't own the map, you need to do the same thing obviously, but in public Versus, where you just need some luck to get the map to appear in the rotation. A convenient workaround is that you only need one person in the private lobby to own the map and then you can select it from the menu in a Private Versus lobby, so you can get a friend that has the map to help you.
Go to Versus > Host Private > Switch the map to Security > Press
to open the match options menu > Switch "Fill with bots" to On. If you have a second controller, you can put your guest on the other team and not use bots at all. If you do end up playing with bots, keep the Bot Difficulty set to Casual just to make it easier and faster.
You'll obviously need to be playing as Minh. Any variant of that character will do and his most common one, E-day Minh, can be crafted at any time for 600 Scrap.
Start the match like you normally would and just go straight to the small balcony that's in the middle of the closed corridor. It's the one to your right hand side when you get out of the COG spawn. Walk up to the button, press
to deactivate the lasers and then wait a bit for the sirens to go off, informing you that the lasers are about to be activated again. The achievement will pop then and it doesn't matter if you die in the process.
EDIT: Based on xXKING R4VENXx's comment, this can also be unlocked in Horde.