I just got out of a game where the final 2 players were a fully powered-up Jugg (They had three kills) and a Pest, We were all so hyped to get it, they were literally the final 2 players of the night and attacked each other but no one got the achievement.
It was a huge and I mean massive disappointment.
Edit: I logged back in a few hours later and got the achievement. Not sure if it was manually given to me or what but I did get it after some delay.
Thank you!