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