It's easiest to do this once you do the final jump back to the home station, that way there are no enemies to distract.
Manually move all but 2 crew members to the airlock. Set one of your remaining people on the security station. On the security station, select to purge room 1. After the countdown, your people will be sucked into space earning you the below achievement.
When you return to the station, you will get the achievement.