Here is the full list of all 20 Silent Night - there are A Christmas Delivery achievements.
You reached 1 000
You reached 5 000
You reached 10 000
You reached 50 000
You reached 100 000
You reached 500 000
You reached 1 000 000
You reached 5 000 000
You rode on the water
You rode in front of the moon!
You went through a fir tree
You went under an arch
You went through 15 fir trees in a row
30 islands without a crash. Nice!
You really like water!
A nice start!
A good combo!
Let's get down to business!
Now that's some serious skills!
Maybe you should rest now...