Deadfall Adventures

This is trivial. Unfortunately, the multiplayer is dead.

You only need 1 other person. Play Deathmatch. (private matches do not count) Meet up in the center of the map and have one person get all of the kills. This unlocks at the end of the match.

Switch, then repeat.

As already mentioned multiplayer is dead only certain parts of the day can you even find a match I got this my playing regular tdm not really trying there are 4 different killing rewards the last being a zombie pretty easy to do without boosting just using an smg and my advice don't ads only hipfire the dual wield pistols are also pretty good essentially all you have to do is go on an 11 kill streak to get all 4.