Zombie Army 4: Dead War

A good place to unlock this is during the first mission Dead Ahead. (Best done solo)

Set up:
Campaign
Mission - Dead Ahead
Chapter 2 - Locomotive Lockdown
Difficulty - Hard
Enemy player setup - 1 player (haven’t tested 4 player enemies as it’s probably much easier to get the combo above 20)

As it starts search the small chest for drag grenades. Proceed with the mission to the first objective where you go up the stairs to the gate that you have to open with a ramp to walk down, there will be a small cutscene which you can skip, zombies will start coming from the train etc, back up so you are stood back at the very top, only shoot the enemies which get close so more can be stood in a group at the bottom, throw your grenade slightly towards the right, once it explodes it will blow up the surrounding explosives knocking down the cargo pallet and setting off the other explosives. The achievement should pop afterwards. If you don’t manage to reach 20 combo just keep reloading checkpoint

If the achievement doesn’t pop here and you got above 20 combo from the 1 grenade like me, just restart checkpoint and once in the loading screen it should pop 👍

Here is a very simple way to get this achievement in a matter of seconds ...

Mission : All Roads Lead To Hell

Chapter : Hitlers Welcome Party

Difficulty : Whatever You Wish

Enemy Setup : 1 Player or more if You Wish

Load the mission and then exit the Saferoom ... In front of You are loads of Zombies just standing there - get their attention ( by shooting one ) and as they start to approach You shoot the trap to the right of the group ... then sit back and enjoy your achievement as in a few seconds the trap will explode killing at least 30 enemies in one explosion !

Any questions ... Then please leave a message in the comments below !!

Meat Locker Chapter 4 - I found this to be the easiest way to "Come and get it" just start it up grab the 4-5 Artillery flares available in the Bunker. Gives you plenty of chances to hit n' miss.

Overall have patience corral a decent horde to a reasonable area and Rain down that Righteous Death to the Undead Horde.

Video provided by Iron Goat Gaming.

Video guide for this and my first give away