The Monsters Pack Add-on for Coloring Pixels has 21 achievements.
Complete image 1 on the Monsters book.
Complete image 2 on the Monsters book.
Complete image 3 on the Monsters book.
Complete image 4 on the Monsters book.
Complete image 5 on the Monsters book.
Complete image 6 on the Monsters book.
Complete image 7 on the Monsters book.
Complete image 8 on the Monsters book.
Complete image 9 on the Monsters book.
Complete image 10 on the Monsters book.
Complete image 11 on the Monsters book.
Complete image 12 on the Monsters book.
Complete image 13 on the Monsters book.
Complete image 14 on the Monsters book.
Complete image 15 on the Monsters book.
Complete image 16 on the Monsters book.
Complete image 17 on the Monsters book.
Complete image 18 on the Monsters book.
Complete image 19 on the Monsters book.
Complete image 20 on the Monsters book.
Complete all images in the Monsters book.