Finding all Bracelets in The Station will unlock the Access Granted achievement / trophies. You can find these bracelets for Aiden Mila and Sila.
AIDEN BRACELETThe first bracelet can be found in the Maintenance Area just next to Aiden's Room. Turn right inside to find Aiden's bracelet locked away in the tool rack. Return all 4 tools that are spread across the room to open the workstation and collect Aiden's ID bracelet.
MILA BRACELETMila's ID bracelet is straight forward and can be found in her room sitting on a table upstairs.
SILAS BRACELETThe last bracelet for Sila can be found after you repair the Engineering room. Once this is complete, you can enter Sila's room and solve a little puzzle inside the room. To get into the locked room with the bracelet, check the bookshelve left of the big window and find the code on a book called "Revolutionary Reminders".