The description for the Snowblind achievement in EDGE states that you need to find some switches.
Find the six hidden switches in the snow-covered levels in December.
Which levels are the snow-covered ones, and where are the switches?
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This thread explains it all pretty well.
Three levels were updated with snow - Normal 1, Bonus 1, and Extended 6. Each of these have two hidden switches.
Here are the locations of the switches for Normal 1:
Here are the switch locations for Bonus 1:
Here are the switch locations for Extended 6:
Finally, this video shows you where to find them all if the pictures were not clear.