Yakuza: Dead Souls

The Kamurocho Subterranea missions starts with a man called Kine, which you first meet in Part I Chapter 4 as Akiyama. He is usually found next to the Gate entrance to the Quarantine Zone in every protagonist's final chapter. Your task is to locate the manhole leading to the underground tunnels that Kine speaks of. The location is indicated in your Menu > Missions > Subterranea. The trophy unlocks the moment you enter the tunnels.

Although completion of these Subterranea missions is not necessary for this trophy, it is a pre-requisite for the "Amon's Vanquisher" trophy. You need to venture down the tunnels as much as possible and complete a pre-determined "boss fight" against a zombie mutant. Completing these battles will start a short scene, and allow you to return to Kine for the next mission. Every character has two missions except for Kiryu who has only one. You should bring along 2-3 Batteries and 4-6 Healing Items before starting each mission. Sometimes you will find the Underground Vendor on random levels who will sell you Batteries, Healing Items and Ammo. After completing the first mission, you need to head back to Kine who is either at the Entrance Gate or in Purgatory (for Kiryu) and speak with him to complete the mission, then start the 2nd mission.

Akiyama
Manhole Location: North-side of Theater Ave
1st Mission: Head to 5F
2nd Mission: Head to 15F

Majima
Manhole Location: Park Alley, Northwest of Shicifuku Parking Lot
1st Mission: Head to 10F
2nd Mission: Head to 20F

Ryuji
Manhole Location: North-east of Hotel District
1st Mission: Head to 15F
2nd Mission: Head to 25F

Kiryu
Manhole Location: Easternmost side of Taihei Blvd East
1st Mission: Head to 30F

*Note: You fight Rasetsu Amon for the first time as Kiryu. Maintain your distance and always evade his Red-Black wave attack. Hit him with the Assault Rifle or Anti-Material Rifle.