DOOM

IMPORTANT UPDATE 21/7/17: WITH THE QUESTIONABLE CHANGES TO MULTIPLAYER THAT LAUNCHED WITH THE 6.66 UPDATE 20TH JULY 2017, THE BELOW IS UPDATED. ITS ALSO BEEN REPORTED THAT DOUBLE KILLS WORK

THIS DEMON UNLOCKS AT LEVEL 28.

Trickiest achievement on the DLC, but shouldn't be too bad.

How to equip a demon:
When you loadout before a MP game (well most games, some modes like freeze tag don't have demon runes), you are asked to picked your loadout and your demon. Pick SPECTRE. You can change it at any time during the match. You can do it on any map, DLC or Base.

Achievement:
Getting kills with the spectre is easy; easiest of the 3 DLC packs so far, however getting a 'multikill' is less so, as you need two enemies in quick succession to be killed. To spawn as your chosen demon, you need to be the first to a demon rune; either by discovery, or by killing an opposing teams demon. The spectre has two attacks, RT to claw and LT to do a rushing charge of about 3 seconds, decimating anyone in his way. The only way I know of doing this effectively is the latter rush attack with LT.

To execute a multikill with the Spectre, you need to kill 2-3 enemies (might now be the latter post update) or more in the same rushing charge (LT) attack. The best way to get enemies lined up or together is in modes like Soul Harvest or Warpath, where enemies will either be trying to kill you to spawn their teams demon, or will be congregated in concentrated areas trying to capture the map's area (any mode where you are asked to select a demon is okay, these two are the easiest in my opinion). When you see 2 or 3 enemies clumped together, hit LT and try and get them all during the same charge . I massively, massively messed up my timing on this and still got it, so you have a little room for error.

Hope this helps; it's not overly clear how you achieve a multikill, and although skill based will require some luck as well!

(P.S. Thanks to No. 1 Richie who pointed out that Private matches does not contribute to achievements.)

It is possible to boost this along with every other MP achievement on Doom.

requirements: minimum of 4 players

once you are in the multiplayer menu, push and select Asia-Pacific. As of writing this the Asia-Pacific servers are D-E-A-D as a doornail. nobody is playing on any mode.

once everyone is ready, select FIND A MATCH and select either Team Play or Team Deathmatch. Team Play has a few modes that spawn no demon runes (I believe freeze tag and infernal run do not, message me if I am wrong or missing modes). Team Deathmatch always has demon runes appear.

The game should match 4 boosters within 30 seconds everyone is searching.

the demon rune should take 1:30-2:00 to spawn.

once it does spawn, head over there with the 2 people who are going to be killed and have them stand right next to each other and kill them both with 1 rush attack by pushing .