Here is the full list of all 18 Star-Crosst achievements.
Learn what Nikita wants to do with his life
Learn what it is that Isol intends to do with her life now that the war is over
Get Carla to admit how she feels about you in chapter 2
Invite Carla over to your house for the night… and then have her clean it up. It was her idea!
Spend the night with Nikita and learn what he’s looking for in a partner.
Stare directly at the Sun with Nikita in chapter 2.
Spend the whole night talking with Isol in chapter 2
Help Isol work through her issues by being a good drinking buddy for her.
Decide the AI's fate.
Sometimes, what you need most when you’re hurting is familiarity
Learn of Nikita’s dark secret
Ask Isol what the difference is between living in Galilei and living on Ghi
Complete Carla’s path.
Complete Nikita’s path.
Complete Isol’s path
Learn what Carla really thinks about Vance and his press release.