1: Join a empty server with 2 other players.
2: Change map to Panj night hunt
3: Go the the left in the corner from the starting point (see video)
4: You will see a radio on a table, hit the action button so it will start the audio and now just wait.
5: I dont know if its normal but our group needed to listen the audio 3x before the achievements unlocks.
6: Oh yeah watch out for bots
Link video: