Single Cut - Score 250 without lifting your blade.
Make sure that you'll play an entire game holding your mouse in a whole game.
So Close - Score 1 shy of the next leaderboard position.
A guy is first and you're second. When you have a new highscore, make sure that you are first and his score is less than one of your score.
Happy Ending - Get a critical on the last fruit of the game.
Get a critical of a fruit of the game after a time ends.
Wake Up! - Play an entire game without slicing.
Play a game without slicing a fruit.
Read more: http://wiki.answers.com/Q/What_are_sensei's_little_secret_in_fruit_ninja_frenzy#ixzz1zkFJu9f9