Photosensitive

Puff-shrooms are extremely mandatory to use for this achievement.

Strategy
This achievement is not too hard to unlock. On Level 2-1, just plant as many Puff-shrooms as you can, you can also use scaredy-shrooms,and you will easily unlock it. You can also use with the Garden Rake and Potato Mines so that you can build your Puff-shroom defense rapidly. You'll be stuck with 50 sun, which is two Potato Mines, so use them wisely. Squashes, which cost 50 sun, are not recommended for getting this acheivement.Or don't pick Sunflower.


 * Note: Completing a Fog level, even with Sea-shrooms, will not count towards this Achievement.