Knock 'Em Dead! is an achievement in Plants vs. Zombies 2. It is achieved by knocking back six zombies with one hit from a Chard Guard. It is worth 5 points on Game Center for iOS devices and 500 XP on Google Play Games for Android devices.
This achievement is quite similar to Magical Fruit, so do the same thing as you would to get the aforementioned achievement. Block zombies with Wall-nuts, Tall-nuts, or other defensive plants except Chard Guard (although using another one as a setup is recommended). Then, use a Chard Guard to bounce them back, thus being awarded with the achievement.
Another good strategy is to have Hurrikale blow the zombies back, then kick them with Chard Guard. Remember, Chard Guard has to bounce back at least six zombies at a time, otherwise you will not get the achievement. Try using Sweet Potato for the easiest chance at this, as it will draw in all the enemies, and you could just place a Chard Guard next to it.
It should be very easy to earn this achievement by using Chard Guard in Endless Zones, especially if you are on Level 100 or above.
- The name of this achievement refers to Chard Guard's Almanac entry.