Sonic the Hedgehog

There is nothing special required to get this achievement. All you have to do is beat the game. You do not need all of the Chaos Emeralds, you do not have a set time limit, and you can die as many times as you like. To beat the Star Light Zone boss you can attack Dr. Robotnik in two different ways; you may use the see-saws to launch his spiked mines back at his ship, or you can use the mines as counter weights to bounce Sonic into the ship. Beating the Scrap Brain Zone/Final Zone boss is a trifle difficult but not impossible. You have 0 rings during this so you cannot get hit; the most dangerous things in this level are the purple electrodes that shoot out from the red sensors at the top of the screen. You have to hit the piston that Dr. Robotnik is hiding inside to hurt him, and yes the pistons can smash you. Hitting Dr. Robotnik is almost a game of luck, so just keep on your toes and you'll eventually be presented with enough opportunities to sink him once and for all.