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.
Attended a concert of three best friends.
Pet every bunny in every town.
You fixed your ship, saved the world, and helped out a giant worm. What's next?
Quadrupled the opportunity for science.
Reached the lowest level of the Silkgem Mines.
Planted flowers.
Filled the museum with priceless artifacts.
Shipping and handling not included.
Picked roses for the princess.
Pumpkin!
He pinch.
"Come on down to Brian's Blasters: you'll love the way you blast."
Pushed a block where it needed to be.
The theme of the game.