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