Dusk Diver 2

Story-related and cannot be missed.

Chapter Unlocks: New max Orb Synthesis level & recipe: Dark Orb (level 2).
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This trophy is for completing Chapter 3, "Welcome to this Crazy City", where you'll also recruit the last member of your party (for now), Bahet. It'll also be your first time visiting two important locations: SCCP and Civic Boulevard (Youshanding).

Other than a couple new side quests, there isn't much to do here beyond the main story. It's a relatively short one as well. Firstly, SCCP is an extremely small area in the Human Realm, with very little to do. As for Civic Boulevard, it's essentially a very long highway, where you'll fight many groups of Chaos Beasts along the way. This location probably has the most fights, as it feels as though there's a battle every few steps.

It's also important to note that at this time, you'll only have access to a part of Civic Boulevard. It has several sections and each one will be unlocked in another Chapter quest. When you reach the end of this Chapter's section, you'll be introduced to a couple very important people, and face another boss fight, this time against a woman known only as "The Mysterious Warrior".

BOSS FIGHT: "THE MYSTERIOUS WARRIOR"
This mysterious woman, who is also wearing a D.ARMS Suit, has a similar fighting style to Yumo, but with a sword. Her speed is definitely the bigger challenge, because she can be quite quick. Overall though, it's not a tough fight. It might have been harder, except that it only lasts until you take off a third of her health. At that point, she runs away and the fight ends, after which you'll get this trophy.