Here is the full list of all 25 Between Horizons achievements.
Become the Chief of Security.
Write the first act.
Write the second act.
Finish the story.
Have a good start at the new job.
Discover William's dark secret.
Discover the truth about your new destination.
Discover your unplanned obsolescence.
Dodge the trap.
Continue your streak.
If you love them, set them free.
Find the rebels' leader.
Those rebels got nothing on you.
Stick to the Codex.
Codex, what's that?
Solve all cases correctly.
Find the hacker.
Visit all places on the ship.
Fulfill the Mission.
Abandon the Mission.
Keep the casualties to a minimum.
Hear the voice of the people.
Decide that you know better.
Make up with the enemy.
Put that suit to use.