Age of Empires IV: Anniversary Edition

This is a pretty easy one to obtain. You can start a 1v1 as the Ottomans with an Easy A.I. with "Maximum" resources, starting age to Age IV, and on any map you please. From there, create a couple of stables to produce some Mehteran. Then create multiple barracks (put them around a blacksmith if you wish for it to be faster) and train a plethora of units from the barracks. Surround all your units around the Mehteran and delete those units affected by the Mehteran. Rinse and repeat until you have reached your 500 "enemies" killed.

This is very similar to jayasme's guide from the "Servants of the Land" achievement but much shorter.

Hope this helps!