Complete the following tasks to unlock Apple Game Center achievements.

Achievement	How to unlock
Dispatched 1 Enemy	Dispatched 1 Enemy.
Dispatched 10 Enemies	Dispatched 10 Enemies.
Dispatched 20 Enemies	Dispatched 20 Enemies.
Dispatched 5 Enemies	Dispatched 5 Enemies.
Dispatched 50 Enemies	Dispatched 50 Enemies.
Disposed of 1 Mine	Disposed of 1 Mine.
Disposed of 10 Mines	Disposed of 10 Mines.
Disposed of 15 Mines	Disposed of 15 Mines.
Disposed of 20 Mines	Disposed of 20 Mines.
Disposed of 25 Mines	Disposed of 25 Mines.
Disposed of 30 Mines	Disposed of 30 Mines.
Disposed of 5 Mines	Disposed of 5 Mines.
Earned 2 Ships	Earned 2 Ships.
Earned 3 Ships	Earned 3 Ships.
Earned a New Ship	Earned a New Ship.
Saved 10 Refugees	Saved 10 Refugees.
Saved 100 Refugees	Saved 100 Refugees.
Saved 20 Refugees	Saved 20 Refugees.
Saved 30 Refugees	Saved 30 Refugees.
Saved 40 Refugees	Saved 40 Refugees.
Saved 50 Refugees	Saved 50 Refugees.
Survived Wave 10	Survived Wave 10.
Survived Wave 15	Survived Wave 15.
Survived Wave 20	Survived Wave 20.
Survived Wave 25	Survived Wave 25.
Survived Wave 5	Survived Wave 5.