While playing the game, type one of the following codes to activate the corresponding cheat function:
| Result | Cheat Code |
| Alternate Lawn Mower appearance | trickedout |
| Candy rains when zombies die | pinata |
| Daisies appear when zombies die | daisies |
| Zombies wear sunglasses | future |
| Zombies have mustaches | mustache |
| Zombies dance | dance |
| Toggles zombie call for brains sound | sukhbir |
Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", "My profile", "View all my games", then the game and view stats.
- 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.
- Better Off Dead: Get a streak of over 10 in I, Zombie Endless.
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