Draw Slasher

This will be the most time consuming and difficult trophy. As you play through the Story Mode, challenges will be unlocked, and by the end of the story you should have access to 19/24 challenges. The remaining challenges are unlocked for maxing out your Ninjutsu skills, by leveling up. There are 5 skills altogether, and each has 3 levels. Levels are gained by acquiring experience from Story Chapters and Arcade Mode games. Note that you do not gain any experience from playing Challenges, so you will need to replay either Story or Arcade to max out your Ninjutsu skills.

The Challenges themselves are quite demanding, requiring you to get specific combo levels, kill certain numbers of enemies, survive for a specific amount of time etc. Many of these challenges will require multiple attempts. Unfortunately health and stamina upgrades from the story do not carry over, and you will not have access to your Ninjutsu power up attacks for most of the Challenges. There are no guaranteed strategies other than time, patience, and a good deal of luck.

You will need to replay most of the Challenges multiple times in order to master them and acquire 3 stars on all 24. Once you have, then this trophy is yours.