| Achievement | How to unlock
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| Better Off Dead ( 15 points ) | Get to a streak of 10 in I, Zombie Endless.
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| Beyond the Grave ( 15 points ) | Beat all 19 mini-games.
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| China Shop ( 15 points ) | Get to a streak of 15 in Vasebreaker Endless.
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| Close Shave ( 5 points ) | Win any level after all lawnmowers have been used.
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| Crash of the Titan ( 10 points ) | Defeat your first Gargantuar.
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| Disco is Undead ( 5 points ) | Hypnotize the lead dancer zombie.
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| Don't Pea in the Pool ( 10 points ) | Complete a daytime pool level without using peashooters of any kind.
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| Explodonator ( 10 points ) | Blast 10 zombies at once with a Cherry Bomb!
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| Good Morning ( 10 points ) | Complete a daytime level by planting only Mushrooms and Coffee Beans.
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| Grounded ( 10 points ) | Defeat a normal roof level without using any catapult plants.
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| Home Lawn Security ( 15 points ) | Complete Adventure mode.
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| Master of Morticulture ( 20 points ) | Collect all 49 plants ( including plants from Crazy Dave's shop).
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| No Fungus Among Us ( 10 points ) | Complete a nighttime level without planting any Mushrooms.
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| Nom Nom Nom ( 10 points ) | Stop the horde using only the Sunflower, Wall-Nut, and Chomper on any level.
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| Popcorn Party ( 15 points ) | Defeat 2 Gargantuars with Corn Cob missiles in a single level.
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| Roll Some Heads ( 10 points ) | Bowl over 5 zombies with a single Wall-Nut.
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| Shopaholic ( 10 points ) | Go trunk diving and spend at least $25,000 on Crazy Dave's Twiddydinkies.
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| Soil Your Plants ( 5 points ) | Plant your first 10 peashooters.
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