Originally Posted by GoJen
It does work. If you're starting a new campaign on hard do NOT do the cheat at the first check point. For some reason it was not working at all, I kept testing it and I was dying. Do it at the 2nd checkpoint which is where the helicopter appears. Once it checkpoints follow the steps. I got the hard achievement.
This is absolutely correct and very important for those of you doing this glitch. This happened to me today when I started my hard playthrough. Make sure you wait to use these cheats until the checkpoint at the helicopter on Chapter 1, Mission 1!! Very important or you will not get the achievement.