No Fungus Among Us

Strategy
This achievement can be extremely difficult to obtain if done incorrectly.

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

Note: Doing the note listed above doesn't work on Game of the Year edition on PC, as the vases do not contain mushrooms. Doing an I, Zombie level without mushrooms (such as the first one also counts for the easiest way to get this achievement, even on Game of the Year PC.

Note: Completing a Fog level without using mushrooms does not unlock this Achievement, plus you can try to get it when you beat this game.

Note: Doing the Mini-game Whack a Zombie won't earn you this Achievement, even if you choose not to use 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 reverse of the Achievement Good Morning.
 * This also a reference to SpongeBob SquarePants Season 5 Episode Fungus Among Us.