Aliens vs. Predator

Aliens vs. Predator

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Killer Instinct and Serial Killer Achievements
By BENNI.RoR
I wrote this guide because literally not a single other achievement guide mentions a crucial fact about the two most annoying achievements "Killer Instinct" and "Serial Killer": you can get them in a private lobby with a friend who can boost you. Maybe this is common knowledge in the playerbase and nobody bothers to mention it anymore, but I find it noteworthy that not a single guide mentions this. Neither do guides you can find in the internet.
   
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How to do it
Create a private lobby and invite your friend. Pick one of the smaller maps to speed up the process of farming kills/wins. Set the round to 5 minutes with 10 points required for a win. Hop into the game. The Predator is a good way to quickly farm the wins because he can easily one-hit enemies at a distance and his vision modes allow you to find your buddies even faster. Farm the kills and you'll get those pesky achievements in roughly 30 minutes.

Obviously you need a buddy willing to let himself get killed over and over again to get the achievement.