Here is the full list of all 31 SUNLESS SKIES achievements.
Become a hero to the Tacketies.
Chart all the ports in the Reach.
Upset the balance of power in the Reach.
Resolve Captain Whitlock's Legacy.
Pass your locomotive to a new captain in your lineage.
Retire to a grand mansion with a hoard to make a dragon envious.
Retire to a life of fame, having written the Song of the Sky.
Learn the secret that the stars hide, and find a way it won't kill you.
Complete the quest for the Martyr-King's Cup.
Be consumed by your nightmares.
Succumb to your terror.
Advance a captain to level 20.
Chart all the ports in Eleutheria.
Chart all the ports in Albion.
Chart all the ports in the Blue Kingdom.
Have all the following scouts and mascots aboard at once: the Inadvisably Big Dog, the Perfect Pangolin, the Useless Cat, the Diffident Bat, the Star-Smitten Bat, the Intrepid Cavey and the Ratronaut.
Decide the fate of Percy Blythe.
Learn the Unassailable Founder's secret.
Complete the Boatman's journey.
Anger all the sky-gods at once.
Become a valued agent of the Windward Company.
Appoint a full complement of officers, including a Mascot.
Restore the Clockwork Sun to its strength and its glory.
Continue a lineage to its seventh captain.
Have 0 Crew, 0 Fuel, 0 Supplies, and Terror of 90 or more.
Visit all four regions with a single captain.
Possess a soul devoid of redeeming qualities.
Return from a Weft of Unravelling Time.
Launch a successful expedition into the Graveyard of Stars.
Fly your locomotive beyond Death's Door and there meet your end.
Hatch and adopt a certain lovable scamp, even if he keeps stealing your crew's fingers and toes.