There are many special achievements in "Call of Duty: Black Ops 6". David vs. Goliath is one of them. If you want to achieve this achievement, you can use RC-XD to destroy APC in Checkmate. An armored personnel carrier will eventually appear while protecting the safe house from attacks at the front door.
How to do David vs. Goliath achievement in Call of Duty 21 Black Ops 6
David vs. Goliath
In Checkmate, use RC-XD to destroy APC
An armored personnel carrier will eventually appear while protecting the safe house from attacks at the front door. You need to weaken it and then blow it up with RC-XD. To weaken it, I recommend using the nearby rocket launcher twice and then shooting it until it starts to catch fire. Then take out the RC-XD and beat the hell out of that guy.