Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
Chilled (60 points)	Kill 20 elves while they are frozen.
Done That (40 points)	Use all upgrade types in one game, 3x weapons, 3x effectors, 2x points.
Easy Pickings (40 points)	Elfserminate 50 levels.
Guarded (50 points)	Complete (5 points) present stacks in a single game.
Nice Job! (20 points)	Score over 5,000 points.
No Way! (80 points)	Score over 80,000 points.
Rapid Fire (120 points)	Kill 10 big red elves with the blunderbuss in a single game.
Roasted (80 points)	Roast 10 blue elves whilst in 2x mode.
Sociable (100 points)	Send Christmas cards to 10 friends.
Sore Thumbs (80 points)	Kill 5,000 naughty elves.
Swiss Cheese (80 points)	Puncture the lungs of 100 green elves.
Wowsers! (50 points)	Score over 10,000 points.