Sorry for the slight bump but I just completed it on Hard. Now I just gotta do it on Crushing. How hard would you say that is? Also, there's not many more trophies for me to get on it now. All I need is:
Stealth Attacker
Steal Fist
Steal Fist Expert
Dyno-Might! Expert
Grenade Hangman
Survivor and
Charted! - Crushed
Those should be quite fun to get, I reckon. It looks like this may well get me my first Platinum.