Morticulturalist

To get this Achievement, you must beat Adventure Mode and buy all the Upgrade Plants and the Imitater from Crazy Dave's shop. To buy the Upgrade Plants and the Imitater you will need $98,000 altogether.

Trivia

 * In the Xbox Live Arcade version, this achievement is called "Master of Morticulture".
 * This Achievement is similar to the Nintendo DS version achievement "Book Learner". However, it requires encountering the Zombie Yeti, which means that the player has to play Adventure Mode at least to the second time.
 * The old image for this achievement is a yellow background with a Sunflower winking.
 * The Sunflower in the song Zombies on Your Lawn also wink at the end.
 * This is the only achievement where Crazy Dave awards you with the achievement.
 * The new image looks like a hand being mutated into a plant.
 * The new image might be a reference to the phrase "green thumb".
 * The hand on the new image only has 4 fingers and the thumb turns green, just like a zombie.
 * You must complete adventure mode at least once, since the Winter Melon, Cob Cannon and the Imitater can only be obtained after completing Adventure Mode once.
 * It is only one achevement in Goty version.