Better Off Dead

For strategies, see I, Zombie or Puzzle Mode.

To unlock this Achievement, simply eat all the brains ten times in a row in I, Zombie Endless, reaching a streak of ten.

Strategy
When attempting this achievement, one should first make sure to take out Umbrella Leaves and Magnet-shrooms, as many zombies rely on metal objects. In rows without Kernel-pults or Fume-shrooms, Ladder Zombies are suggested, as their ladder shield effectively protects them from Snow Peas. Removing the Snow Peas should be your next priority, after the Umbrella Leaves and Magnet-shrooms. If you like to use Digger Zombies, make sure Split Peas and Starfruit are eliminated, especially to protect your Imps. Torchwoods and Threepeaters should also be wiped out as soon as possible. Spikeweed is a lesser threat but tread with caution when using Imps, as they'll only survive one hit after crossing Spikeweed. Use Dancing Zombies against rows with foward fire, as the Backup Dancers will be the ones killed. Do NOT use Dancing Zombies against Spikeweeds. Also, don`t use a zombie to eat a few plants, and then discard it. This is using your sun.

Trivia

 * The name of this achievement most likely is a reference to the movie Better Off Dead.
 * This is one of the three Achievements that are in Puzzle Mode, the others being China Shop and Think Hard.
 * The picture looks like a Zombie close-up in the eye with the number ten in the middle, followed by an exclamation point.
 * It also appeared in Version 1.9 in the iPhone version with the Plants vs. Zombies update.