Age of Empires IV: Anniversary Edition

This achievement can be acquired in the 2nd Mongol mission called the Great Wall. As soon as you gain control of your troops, march your scouts to the enemy wall. They will be killed almost instantly. I didn't unlock the achievement here so as soon as the rest of my army showed up I had them attack the front gate as well. After a few seconds of losing some of my units, the achievement popped. Once the achievement pops you can restart the mission and do it properly.