Book Learner is an achievement unlockable in the Nintendo DS version of Plants vs. Zombies. In order to achieve it, the player must fill out the Suburban Almanac, meaning that he or she has to encounter every zombie and obtain every plant.
This achievement is not too difficult to get. To earn it, all the player has to do is to beat Adventure Mode, buy all the upgrade plants including the Imitater with a total of $98,000 from Crazy Dave's Twiddydinkies, and encounter the Zombie Yeti in Level 4-10 when replaying Adventure Mode. It is just like a combination of the achievements Morticulturalist and Zombologist or Cryptozombologist from the other versions.
Note: The player might need to do some gold farming to buy upgrades and Imitater.