NOTE: This method can also be used to earn an S Rank for a 2-for-1 deal.
For this trophy you'll have to earned an A Rank for Threat of the Seven Swordsmen battle, which is in conjunction with a decision for 1 or 3 Mob battle, and Boss Battle. These battles all have seperate Ranks, which give you an overall Rank, which needs to be an A for this trophy.
For FACTORS on reaching high Rank for Boss/Pseudo battles please consult with this trophy solution:
This battle is EXTREMELY hard to do with all 6 at once, due to no Zetus' for bonus requirement of not being able to use behind attacks and high combo hits. So the better choice for this achievement would be to split them up. The first part will be a Mob Battle against 6 of the 7 Swordsmen minus Zabuza). Depending on the Ultimate Decision, you'll be able to battle all 6 at once or split them up into 3 battles.
You'll be starting off with Sakura against a group of Zetsu and the explosive Swordsman, Jinpachi Munashi. Be wary of his slow, yet powerful explosive sword attacks. You'll want to rack up combo hit and use Ninjutsu, also using the behind attack feature for bonus points later on. For best results be sure to defeat at least 30 Zetsu, do at least 10 behind attack features, and initiate 2 Burst Triggers before finishing off the Swordsman. And that goes for all 3 sections.
The second section of the battle will be Lee, with Sakura as a support, against The Lightning blade wielder, Ameyuri Ringo, and the Sewing Needle wielder, Kushimaru Kuri'arare. With these 2 Swordsman you'll have to be wary of their lightning fast attacks. Just take the same actions, using your supports as well, and precautions as the previous battle and you should be fine.
The final part of the Mob battle will be Guy, with Sakura and Lee as supports, against the Swordless Shark Skin wielder, Fuguki Suikazan, Jinin Akebino, with a sword that can smash defenses, and the most dangerous of them all, Mangetsu Hozuki. For this you'll want to take out Fugaki as soon as you can, just because his needle hair ability can screw your combos up and leave you vulnerable to attacks. Mangetsu can use projectile water jutsu so be aware of that, and Jinin will guard break you if you let him. But just follow the previously described actions and precautions and you should win with a good rank.
The actual Boss Battle will be Kakashi vs Zabuza and Haku. After which Haku will be disposed of, with just you an Awakened Zabuza.
If you've managed to earn each Secret Factor up until this battle you'll earn this trophy:
If, for any reason, you aren't able to earn an A Rank no worry. You can retry ANY battles post-story in the Ninja World timeline for another try.