Very simple achievement, have the same setup if you want this easily:
1 player (for enemy quantity)
You can do this solo or with friends whichever you prefer, I personally done this with a friend with the other 2 slots open for randoms to join throughout, basically survive until wave 12 once you complete wave 12 a section of the map becomes clear for “escape” everyone who is alive at this point must get in the circle for you to escape, upon the match ending the achievement will pop!
Hope this helps clear anything up! 👍 Happy Hunting!!