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