Here is the full list of all 18 Lost Nova achievements.
Expensive headwear.
Made a small friend.
Pet every bunny in every town.
Witnessed the righteous fury of Sir Corv.
You fixed your ship, saved the world, and helped out a giant worm. What's next?
Attended a concert of three best friends.
Picked roses for the princess.
Filled the museum with priceless artifacts.
Planted flowers.
Reached the lowest level of the Silkgem Mines.
Shipping and handling not included.
"Come on down to Brian's Blasters: you'll love the way you blast."
He pinch.
Quadrupled the opportunity for science.
Pumpkin!
"What a novelty you are."
Pushed a block where it needed to be.
The theme of the game.