The Unknown Pack Add-on for Coloring Pixels has 21 achievements.
Complete image 1 on the 1980s book.
Complete image 2 on the 1980s book.
Complete image 3 on the 1980s book.
Complete image 4 on the 1980s book.
Complete image 5 on the 1980s book.
Complete image 6 on the 1980s book.
Complete image 7 on the 1980s book.
Complete image 8 on the 1980s book.
Complete image 9 on the 1980s book.
Complete image 10 on the 1980s book.
Complete image 11 on the 1980s book.
Complete image 12 on the 1980s book.
Complete image 13 on the 1980s book.
Complete image 14 on the 1980s book.
Complete image 15 on the 1980s book.
Complete image 16 on the 1980s book.
Complete image 17 on the 1980s book.
Complete image 18 on the 1980s book.
Complete image 19 on the 1980s book.
Complete image 20 on the 1980s book.
Complete all images on the 1980s book.