i believe that there is an easy explanation at the "nightmare achievement". You don't have to play the whole game,just start a chapter,wait till the first autosave,go to chapter select and choose the last part of the chapter and play trough that last part. do this for all the chapters. If you do it on nightmare you will also get the normal and hard playtrough achievement. But you have to play trough the whole game once for this to work I believe. I tried it and it works. All the credits go to the original poster of this solution ofcourse!
Comment #21 by Mr PaNtsONhEaD Sunday, June 26, 2011 @ 12:34:09 PM
If you do not want to play through the entire game again on Nightmare or find it too frustrating, you can "cheat" the achievement assuming you have completed the game once already.
Start a New Game + on Nightmare and exit out after the first autosave. Go to Chapter Select, select the final part of Chapter 1 and complete it. Play through the beginning of Chapter 2 until the first autosave. Go to Chapter Select, select the final part of Chapter 2 and complete it.
Above works! I just tried it. It takes less than 10 minutes to do it.. Less than 5 minutes!! It was soo easy and I just got 3 achievements. I'm really glad because I was getting tired of playing the game from one game play on easy lol. Thanks for the tip sapphire1983 (:
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