Using this method can earn you 3 achievements from a single Android. At the very beginning of mission 4 you will go down a hall way and see an Android with his back to you. Hit him a couple of times with the jack and then turn around and run to the beginning of the level. If you did not receive damage from the Android the "Not A Scratch" achievement will pop. Now go back and sneak up behind the Android and swing a couple more times and then flee again. Do this until he is dead which is about 6 to 7 hit with the jack. Once dead you will earn "Fault Detected" and "My Turn Now".