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