Here is the full list of all 18 Lost Nova achievements.
Expensive headwear.
Made a small friend.
"What a novelty you are."
Witnessed the righteous fury of Sir Corv.
Quadrupled the opportunity for science.
Planted flowers.
Pet every bunny in every town.
Reached the lowest level of the Silkgem Mines.
Filled the museum with priceless artifacts.
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.
"Come on down to Brian's Blasters: you'll love the way you blast."
Shipping and handling not included.
Pumpkin!
He pinch.
Pushed a block where it needed to be.
The theme of the game.