Plants vs. Zombies: Game of the Year
21 Achievements
40-50h
Steam
Cryptozombologist
Discover the top secret zombie
18.0%
How to unlock the Cryptozombologist achievement in Plants vs. Zombies: Game of the Year - Definitive Guide
You need to beat the Adventure mode once and beat it again to level 4-10 and then kill the yeti and beat 4-10