To unlock crew profiles from the Archive menu, you must either obtain their specific ID card or perform a certain task.
Unlockable How to Unlock Alex's Profile Get the silver ring (obtained from the vent access in the Cold Sleep Chamber) and place it on Alex's desk (Crew Quarters 6) Alyssa's Profile Exterminate all 20 space leeches
There are two extra side stories you can unlock to get some background information on the game's plot.
Unlockable How to Unlock Alyssa's Story Get the silver ring (obtained from the vent access in the Cold Sleep Chamber) and place it on Alex's desk (Crew Quarters 6) Space Leech's Story Have a Aero Porter, Liberation Maiden or Crimson Shroud save file, finish the game and access Linked Content
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