Here’s a complete list of Plants Vs Zombies Cheats as well as all of the acheivements available on all the different devices.

PC Cheats

Type while playing:
trickedout: Alternate lawn mower
mustache: Zombies with mustaches
future: Zombies with sunglasses
slowboke: Slow zombies
dance: Dancing zombies
pinata: Get candy when zombies die
daisies: Get daisies when zombies die
sukhbir: Turn on/off zombies “brains” sound effect

Xobx 360 Cheats

Hold down LB, RB, LT, and RT together while playing to have the cheat menu appear:
trickedout: Alternate lawn mower
mustache: Zombies with mustaches
future: Zombies with sunglasses
slowboke: Slow zombies
dance: Dancing zombies
pinata: Get candy when zombies die
daisies: Get daisies when zombies die
sukhbir: Turn on/off zombies “brains” sound effect

Xbox 360 Achievements

Alive and Planting: Survive 40 waves of zombies.
Close Shave: Win a level after using up all 5 lawn mowers.
Crash of the Titan: Defeat a Gargantuar.
Explodonator: Destroy 10 zombies with one Cherry Bomb.
Home Lawn Security: Complete Adventure Mode.
Master of Morticulture: Collect all 49 plants.
Nom Nom Nom: Complete any level using just the Sunflower, Wallnut and Chomper plants.
Shopaholic: Spend $25,000 on Crazy Dave’s Twiddydinkies while trunk driving.
Smarty Branches: Get the Tree of Wisdom to over 100 feet.
Soil Your Plants: Plant 10 Peashooters.
Versus vs Versus: Get a 5 game winning streak in Versus Mode.
ZFF’s 4 Evr: Bowl a winner in Co-Op Wall-Nut Bowling.

iPhone, iPad, and iPod Touch Achievements

20 Below Zero: Freeze 20 zombies with one Ice Shroom.
Alive and Planting: Survive 40 waves zombies.
Blind Faith: Complete a foggy level without Blovers or Planterns.
Chill Out: Destroy 3 bobsleds on this level.
Defcorn 5: Build 5 Cob Cannons in any level.
Don’t Pea in the Pool: Complete a daytime pool level without Peashooters.
Explodonator: Destroy 10 zombies with a single Cherry Bomb.
Flower Power: Keep 10 Twin Sunflowers alive on any level.
Good Morning: Complete a Daytime level using only Mushrooms and Coffee Beans.
Grounded: Complete a Roof level without Catapult plants.
Home Lawn Security: Complete Adventure Mode.
Last Mown Standing: Defeat the last zombie in a level with a lawn mower.
Lawn Mower Man: Kill 10 zombies with one lawn mower.
Melon-y Lane: Plant a Winter Melon in each lane of any level.
Monster Mash: Destroy 5 zombies with one Squash.
Morticulturalist: Collect all 49 plants.
No Fungus Among Us: Complete a Nighttime Level without using any mushrooms.
Penny Pincher: Pick up 30 coins on one level without losing any.
Pool’s Closed: Complete a pool level without aquatic plants.
Popcorn Party: Kill two Gargantuars using Corn Cob Missiles on any level.
Pyromaniac: Complete any level using just explosive plants.
Roll Some Heads: Bowl over 5 zombies with one Wallnut.
Second Life: Complete Adventure Mode twice.
Spudow!: Kill a zombie using a Potato Mine.
Sunny Days: Get 8,000 sun points on any level.
Zombologist: Find the Zombie Yeti.

Nintendo DS Achievements

Attention Deficit: Earn a trophy in every Mini Game.
Book Learner: Fill out the almanac.
Cerebral Canopy: Grow your Tree of Wisdom to over 100 feet.
Demolitioneer: Destroy 10 zombies with one Cherry Bomb.
Don’t Drink the Water: Beat a pool level without aquatic plants.
Greenhouser: Raise 10 plants to full size in the Zen Garden.
Nebulaphile: Beat a foggy level without disturbing any fog.
Photosensitive: Complete a Nighttime level without picking up any sun.
Resolute Homeowner: Complete Adventure Mode.
Shopping Spree: Spend $25,000 in Crazy Dave’s Store.
Street Team: Play Download-play Multiplayer at least once.
Think Hard: Get a trophy in every Puzzle Mode.
Tough Beans: Get a trophy in every Survival Mode.
Unsiege Mentality: Complete a Roof level without Catapult plants.

Steam Achievements

Ask Me About Mustache Mode: Enable Mustache Mode.
Better Off Dead: Get streak over 10 in I, Zombie Endless.
China Shop: Get streak of 15 in Vasebreaker Endless.
Cryptozombologist: Find the Top Secret Zombie.
Explodonator: Destroy 10 zombies with one Cherry Bomb.
Home Lawn Security: Complete Adventure Mode.
Immortal: Get 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.