GALAGA

If you die just start from the last level you played. Very easy.

First make it all the way to level 20 and complete it if you are not at level 20 then just get there if you lose all your lives then just start on the level you were on by clicking play and moving the arrows to any completed levels or what ever the level you are working on and once you reach level 20 you should play it and once you complete it the achievement will unlock for a good 10 points very easy achievement