Cryptozombologist

Difficulty: Medium-Hard

Cryptozombologist is an achievement unlockable on Xbox Live, iOS, and the old Steam version of Plants vs. Zombies. It has the same requirement as Zombologist. 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 time the player plays Level 4-10, as well as in some random levels and some specific mini-games listed at their own page (it will only appear in mini-games after the player encounters it on level 4-10). The player doesn't need to kill it to obtain the achievement. It will give 5 precious diamonds when first killed and 4 after that, but will run away after a short time on the lawn so the player should make sure they kill it quickly.

Trivia

 * The word "Cryptozombologist" comes from the Greek kryptos, meaning "hidden, secret," and -logia, meaning "study."
 * Also,it might be a potmanteau beetween the words "zombie" and Cryptologist.
 * This achievement is called Zombologist in the iOS version and Game of the Year Version for the PC and Mac (excluding the Steam versions).
 * In Game of The Year Edition, it says "Discover the Yeti Zombie" instead of "The Top Secret Zombie". Technically, this is because it's a completely different achievement; it's also called Zombologist instead of Cryptozombologist, but in the Steam Version, the description is the same as Zombologist.
 * If you use the I, Zombie Hack and plant a Zombie Yeti, then you won't get the achievement.