Here is the full list of all 34 Squirrels are going nuts achievements.
Clear World One
Clear World Two
Clear World Three
Clear World Four
Clear World Five
Clear World Six
Clear World Seven
Clear 50 Levels in one game
Clear 75 levels in one game
Clear 100 levels in one game
Destroy all tiles on World One
Destroy all tiles (including previous Worlds) on World Two
Destroy all tiles (including previous Worlds) on World Three
Destroy all tiles (including previous Worlds) on World Four
Destroy all tiles (including previous Worlds) on World Five
Destroy all tiles (including previous Worlds) on World Six
Destroy all tiles (including previous Worlds) on World Seven
Complete World One without using restart
Complete World Two (including previous Worlds) without using restart
Complete World Three (including previous Worlds) without using restart
Complete World Four (including previous Worlds) without using restart
Complete World Five (including previous Worlds) without using restart
Complete World Six (including previous Worlds) without using restart
Complete World Seven (including previous Worlds) without using restart
Complete World One without getting hit
Complete World One (including previous Worlds) without getting hit
Complete World Three (including previous Worlds) without getting hit
Complete World Four (including previous Worlds) without getting hit
Complete World Five (including previous Worlds) without getting hit
Complete World Six (including previous Worlds) without getting hit
Complete World Seven (including previous Worlds) without getting hit
Kill a total of ten thousand enemies
Collect a total of five thousand coins
Destroy a total of one hundred thousand blocks