Start A New Game (Heavily Advised)
Finish The First Mission, Then When You Get Back To Athena Station - Put Everyone But Two Guys In The Airlock (Area 1) And Vent Them Into Space.
Wait For Them To Faint, Then Wait For Their Death Timers To Drop To 0, Achievement Pops When You Land At The Station.
You Can Also Combine This With The Below Achievement By Issuing The Abandon Ship Command, Sending Your Second To Last Guy Into The Escape Pod. (Then Land)
The Abandon Ship! achievement in Space Crew worth 24 pointsSave one or more crew members from certain death by issuing the abandon ship commandGood Luck!