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''"Kill the crew of 20 ships by sector 6 in the [[Mantis Cruiser]]."''
Unlocking this achievement requires the entire enemy crew of each ship to be killed either by [[Boarding|boarding]] personnel, [[Fires|burning]], suffocation, or some other method that leaves the enemy ship intact. Simply destroying an enemy ship with its crew inside does not count.
"By sector 6" means the crews have to be killed ''by the end ''of the sixth sector, not by the beginning of it.