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