Close Shave

Strategy
In Wall-nut Bowling, when a huge wave of zombies appears, let them use up the Lawn Mowers and then play the rest of the level.

Also, in Whack a Zombie let one zombie get by in each row but play the rest of the level as normal.

You can even play any level but dig up all your plants in the final wave.

Trivia

 * The Achievement's name comes from the phrase "close save".
 * It cannot be found in the Game Of The Year version.
 * In the Xbox game, this achievement can be earned in VS mode.