To obtain the Challenge "Kill Streak" ("Get a Kill Streak of 8") in the "Cold Darkness" mode of Rise of the Tomb Raider, you simply need to kill 8 enemies in rapid succession.

You will have the highest success rate, if you simply wait for a swarm to begin and then quickly finish as many opponents as possible with a weapon of your choosing (like the bow with poison arrows in this video).
To make my life easier, and avoid the necessity to craft arrows during the fight, I used the Expedition Card "Toxicity". With this the challenge should be easy enough.

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