Here is the full list of all 16 Professor Lupo and his Horrible Pets achievements.
Pass the first chapter of the game.
Pass the second chapter of the game.
Pass the third chapter of the game.
Pass the fourth chapter of the game.
Pass the entire game.
Get all the books.
Get all the pieces of music.
Get all the films.
Get all the videogames.
Save all the warlords.
Complete all alien detection zone activation tasks.
Complete all alien killing tasks.
Complete all tasks to save aliens.
Pass all the levels on difficult mode.
Complete the game's replayability to 100%.
Cross the Core Room and get the alternate ending.