Here is the full list of all 20 Santa's Christmas Solitaire 2 achievements.
Complete the Game
Complete 16 Levels
Complete 12 Levels
Achieve 100 Perfects
Use the Gingerbread Man 40 times
Complete 8 Levels
Use the Cake 40 times
Achieve 50 Perfects
Use the Candy Cane 40 times
Complete 4 Levels
Achieve 25 Perfects
Get a Combo of 20 Cards
Earn 30000 Cash
Earn 22000 Cash
Earn 15000 Cash
Achieve 10 Perfects
Earn 5000 Cash
Get a Combo of 15 Cards
Get a Combo of 10 Cards
Get a Combo of 5 Cards