I Did This With The Lanus Cruiser - Type: A
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*Warning: Do Step One Before You Do Anything Else In The Game*
Step One - Pause The Game And Open The All The Doors On Your Ship, Inside And Out, Except For Your Cockpit.
That's It, Only One Step Really.
You Get 2 Small Rooms Or 1 Big Room Worth Of Oxygen For The Entire Playthrough.
- Make Sure You Dont Pick Up Many Crew Members (More Than 1) That Are Not Lanus,
Or They Inevitably Suffocate In Your Only-Space-For-Two-Oxygen-Breather's Ship.
- This Does Make Fire A Non Issue, And The Chance Of A Breach In The Two Rooms That Do Have Oxygen Goes Down Dramatically
Getting Upgraded Doors At Some Point
- Makes Teleporter Nonsense From The Mantis Ships Not Threatening At All!
Getting To Sector 8 Nets You The Achievement, You Don't Have To Beat The Boss.
Good Luck!