No Fungus Among Us

Difficulty: Hard-Very Hard (Extremely Easy in I, Zombie)

No Fungus Among Us is an achievement unlockable on Steam, iOS, PC, PS Vita, Nook, and Android versions of Plants vs. Zombies. It requires the player to complete a night without using any mushrooms but there is a glitch on the PC and Steam versions where it can be completed on I, Zombie.

Strategies
thumb|right|324px|Another Strategy Guide Begin the level by picking Sunflower, Cabbage-pult, Kernel-pult, Potato Mine and Wall-nut. Now, you should pack any instant-kill plants you prefer to use. Purchase the rake as well. This should be done on 2-1, and the guide is assuming it is. If you followed the procedure, getting this achievement will be simple. When the level starts, plant a Sunflower in the same row as the rake. Proceed to do so once more. At this point, do nothing but plant Sunflowers until you have at least five, keeping them out of harm's way. Remember, don't plant them past the second row. Take full advantage of the lawn mowers and ignore zombies until you have enough Sunflowers to retaliate. Now, you may plant a Potato Mine in front of a proceeding zombie to further delay them. When you have a fair amount of Sunflowers, begin to plant Cabbage-pults and Wall-nuts to obstruct the incoming invaders. Don't waste your time using Kernel-pults yet. However, once you have every lane guarded by a Cabbage-pult, you may now plant Kernel-pults. At this point, things will play themselves out as if it were a daytime level.

Note: It is possible to get this achievement through quick-play mode on the iOS or Android versions.

Note: Grave Busters don't count as mushrooms, so you can use those.

Note: Playing an I, Zombie level without mushrooms such as the first level also counts for the easiest way to get this achievement, even on Game of the Year PC.

Note: Playing the first I, Zombie level on the iPhone/iPod version of Plants vs. Zombies doesn't work; you won't get the achievement.

Note: Completing a fog level without using mushrooms does not unlock this Achievement.

Note: Doing the mini-game Whack a Zombie won't earn you this achievement, even if you don't use the Ice-shroom in the Mini-game.

Trivia

 * The achievement's name is based off and is a parody of the term "a fungus among us".
 * This is the opposite of the achievement Good Morning.
 * This and Photosensitive require you to beat a night level.
 * However, Photosensitive requires you to pick up absolutely no sun instead of not using mushrooms.