Ninja Gaiden Sigma Plus

The hardest difficulty of the game. Trophy will unlock after you've completed the entire game on Master Ninja difficulty. Hopefully you become very prepared. You need to use items and weapons wisely. Try to farm a lot of essences to have a full inventory as you progress. Skip some battles if you feel too uncomfortable. The best advice I can give you is to check out my playthrough here (NGS - Master Ninja Mode Playthrough).

During your Hard playthrough, play all the way to chapter 2. Beat Doku and you'll unlock Very Hard difficulty. Continue to play all the way to chapter 9 and defeat Alma so you can unlock the White Tiger Helmet and Azure Dragon Helmet. Its best for defense and offense. Now after you save, exit and start a new game on Very Hard. Play all the way to chapter 2 again and beat Doku to unlock Master Ninja difficulty. Now you don't have to waste time by clearing all the difficulties. You can clear Master Ninja difficulty and the trophies will stack. Thanks to Jigsaw for this info.

Good luck!