Successfully complete one of the following tasks to get a trophy:
  The Prince (Silver): Take the Prince for a ride. 

Additionally, there are eleven secret trophies:
  10 (Bronze): Take 10 inhabitants for a ride. 
  20 (Bronze): Eat 20 inhabitants. 
  100 (Bronze): Stretch BOY to a length of 100m. 
  Bye-Bye BOY (Bronze): Meet up with Bye-Bye BOY. 
  The BOY House (Bronze): Rotate the roof of the BOY House. 
  The Space Squirrel (Bronze): Find the Space Squirrel. 
  BOY Quiz Expert (Bronze): Answer all questions correctly in the BOY Quiz. 
  765 (Silver): Report a length of exactly 765m to GIRL. 
  Unproportional (Silver): Make BOY's body grow thicker while keeping his head 
  small. 
  Combined Character (Silver): Create a combined character by eating an animal 
  and a human or a fruit and a human. 
  Eat Your Words! (Gold): Eat the words NOBY NOBY BOY within the manual or in 
  the staff credits.