Super easy achievement in the last level of COD Vanguard! Wait for the smoke grenade to be tossed and wait for the Jager Morder to appear. Injure him a bit and press UP on the D-PAD for your team to start aiming his way. Once he is eliminated, the achievement will pop.
If you miss it, there are 2-3 other Jager Morders on the same level!