Cryptozombologist

This Achievement is unlocked by encountering the Zombie Yeti, which is found in level 4-10 after beating Adventure Mode for the first time. The Zombie Yeti will appear every once every time the player plays level 4-10.

Trivia

 * Cryptozombologist is not a real word,since it has the word zombie on it.
 * The word "Cryptozombologist" comes from the Greek kryptos, "hidden, secret"; and -logia, "study".
 * This achievement is called Zombologist in the iPod Touch/iPhone/iPad version, and the Game of the Year version for the PC and Mac.
 * It is a combination of the words "Zombie" and "Cryptozoology", literally study of hidden zombies.
 * the image from the ipad looks different,since its not blacked out.