Nobody has to die and you can't kill the Raider. Set the power keys and defend the Super Time Machine in Area X until it reaches 100%. Speed it up by interacting with it, but it may leave you vulnerable.
This is fairly annoying even if you do sweep the Raider as with many 7-man survivals, it usually comes down to a group of Survivors coordinated through a video call absolutely bullying a Raider and killing them early. Thus often the STM won't spawn before the match is over, let alone get completed.