Here is the full list of all 17 Into the Stars achievements.
Kill a Skorn ship in combat
Construct a civilian building
Discovered a new module
Explore a new planet for the first time
Begin your journey
Found a survivor to replace a lost crew member
Completed the journey to Titus Nova
Explore an Ark wreckage
Explore a Skorn wreckage
Find a Storage Container hidden in the world
Mine a planet until the timer reaches 0
Reach Titus Nova on Explorer or higher difficulty
Reach Titus Nova on Normal or higher difficulty
Reach Titus Nova on Pursuit Difficulty
Reach Titus Nova and receive an A or higher Grade
Perform a trade with an Alien Race
Defeat a Menkhet Pirate