Warhammer 40,000: Darktide

It’s worth mentioning that you yourself don’t need to stun the enemies. A fellow Zealot threw his stun grenade and I managed to unlock this by throwing my immolation grenade shortly after.

Make sure you upgrade the flame gun all the way and most importantly, at the upgrade station, refine wpn to add "25% damage unarmored enemy & 25% damage maniacs. Tip: Hold LT & RT to do continuous flame.

Another good spot to try this is in the new update level: Carnival. Put ii on Heresy or Damnation. Get two shield ogrins to block the hole you blow in the wall. Have another zealot throw their stun grenade, your zealot throws immolation grenade right after. Easy peasy. Also a good spot for charging 60 enemies with the bull rush.

^ yeah this ain't it Wookie

https://old.reddit.com/r/DarkTide/comments/1adt62s/darktides...

Above is a clip on reddit of me getting the achievement. The map 'Archivum Sycorax' has an area where you need to run through an alarmed area (series of tunnels) that spawns infinite hordes.

Lure them back to the starting area and have your friends stun them with grenades. Take your flamer out and purge away! Immolation Grenades work too.

Do this on the Karnak Twin operation. When you first fight both twins, before the final fight just ahead of you a horde will spawn when the fight starts. Sprint ahead and nade the horde before it spreads and hit it with your flamer. It finally worked for me and it’s a short mission so only 5-10 minutes between tries.

Spookytooth104 playing Warhammer 40,000: Darktide
I am talking about this section to be more specific. Make sure you have a good flamer, mine was 17 and I had to keep buying in the Brunt Armoury to get one. This took me ages to get in a non private game as other teammates are expected to lay waste to a horde but as you can see if you hang back and allow the twins to attack them first you should get a run on the horde.

Make sure you upgrade the flame gun all the way and most importantly, at the upgrade station, refine wpn to add "25% damage unarmored enemy & 25% damage maniacs. Tip: Hold LT & RT to do continuous flame.

Another good spot to try this is in the new update level: Carnival. Put ii on Heresy or Damnation. Get two shield ogrins to block the hole you blow in the wall. Have another zealot throw their stun grenade, your zealot throws immolation grenade right after. Easy peasy. Also a good spot for charging 60 enemies with the bull rush.

^ yeah this ain't it Wookie

Do this on the Karnak Twin operation. When you first fight both twins, before the final fight just ahead of you a horde will spawn when the fight starts. Sprint ahead and nade the horde before it spreads and hit it with your flamer. It finally worked for me and it’s a short mission so only 5-10 minutes between tries.

Spookytooth104 playing Warhammer 40,000: Darktide
I am talking about this section to be more specific. Make sure you have a good flamer, mine was 17 and I had to keep buying in the Brunt Armoury to get one. This took me ages to get in a non private game as other teammates are expected to lay waste to a horde but as you can see if you hang back and allow the twins to attack them first you should get a run on the horde.

Just an FYI, I completed this but only the penance unlocked and no achievement even after completing the level and confirming in penance menu that I had unlocked it. I quit the game and logged back in and the achievement popped right away

Also I found this video of someone completing it a good point of reference for getting a sense of how dense the pack of enemies needs to be

https://www.youtube.com/watch?v=AhlinKUrG3M