Zombie Costumer Changes
Type These Codes In At Any Time While Playing The Game.

pinata: a shower of candy when a zombie dies
trickedout: Alternate Lawn Mower appearance
future: Gives zombies futuristic shades
sukhbir: toggles the zombie’s call for brains-sound
daisies: Zombies leave small daisies behind when killed
Mustache: Zombies Now Have Mustaches
tohot: Infinite Sun

Hints
NOTE: As their name suggests hints are not exactly Plants vs. Zombies cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Plants vs. Zombies even more entertaining.

Achievements
The following achievements can be unlocked by completeing the task listed for them.

Ask Me About Mustache Mode: Enable Mustache Mode
Better Off Dead: Get a streak of over 10 in I, Zombie Endless
China Shop: Get to a streak of 15 in Vasebreaker Endless
Cryptozombologist: Discover the top secret zombie
Explodonator: Blow up 10 zombies with a single cherry bomb
Home Lawn Security: Complete adventure mode
Immortal: Get to 20 flags in Survival Endless
Morticulturalist: Collect all 49 plants
Nobel Peas Prize: Get the golden sunflower trophy
Spudow!: Blow up a zombie using a potato mine
Towering Wisdom: Grow the Tree of Wisdom to 100 feet
Walk This Way: Hypnotize the lead dancer zombie

Trophies
Complete these tasks to unlock a trophy in the main menu.

Gold Trophy: Get all trophies in Mini-Games, Puzzle, and Survival modes.
Silver Trophy: Complete Adventure mode one time.