GeneralThis can be done in multiplayer. Start a private match and choose the Ulysses map.
In the center of the map are two teleporters. You need to kill all enemys of one round by trowing them in one of the two teleporters. Keep in mind that later rounds equals more enemies per round. Wait for a few seconds between every kill because the teleporters need to cooldown. You need the message "Black Hole Fun +150". Not "Grafity" or just +10.
I would really recommend two things:1. Play the first wave only and with soldiers. If you fail, let them kill you and repeat. If you want to kick them all in restart the mission until you get "Freaks" (follow you) if you want to leash them in go for "Helpers/Soliders" (dont follow).
2.
Very important! Dont try to kick them. I tried this for an hour and it didnt work,
but then I tried using the whip and got it first try - no joke!
Just stand on the oposite site of the teleporter and drag the enemies in the beam.
SideTip for other achievements: "Anarchy Mode" = Multiplayer Mode
My video (in german, but you can mute it)Just Watch the first minute: