Vambrace: Cold Soul

Story-Based achievement that will unlock after you've gone through 5 streets in the Entertainment District and defeated the Ghost Bizarre boss, Manduk the Merchant of Icenaire.

If this is your first playthrough and aren't used to the mechanics, these are tips on what I found easiest to complete each street.

1. Make it from point A to point B in the shortest amount of rooms (meaning if you travel to all the rooms to find loot/treasure risks raising the Ghost Gauge up, where Wraiths try to fight you more frequently, ultimately raising the chance of you dying).
2. Keep an eye on your ghost gauge. The more you travel around from room to room, instead of taking a linear path, the higher your gauge raises. Definitely be mindful when it hits the halfway point and up because it can really damage your team and chance to go forward. The ghost gauge resets after you complete each street.
3. Be strategic about your campfires. The campfires (usually 1-2 per street) help you heal your party's health and vigor with music, sleep, items, and scouting. If your health and vigor are halfway down, use a campfire to heal. Depending on where the campfire is located and watching your ghost gauge amount, decide what options to use (like using the musical option to boost vigor and/or the sleeping option to boost health). Using them too early could raise your ghost gauge 5+ EACH so alternatively its better to use items for healing health/vigor. If the camp is at the near the middle or end of the street, its best to use every option available.
4. Sell and buy from Gerrard the Merchant when you stumble across him. I ended up selling everything I found for the most part because carrying too much has a TERRIBLE debuff on your entire team. Buy selling, you get more Hellion that you can spend on items to heal your Health/Vigor which is incredibly useful.
5. Buy and replenish your Vigor as much as you can. If Lyric's Vigor hits 0, she passes out and you end up back in Dalearch City's Sylvani Healing Hall. Definitely heal Vigor if it hits the halfway point.

Here are streets/locations to name a few:
1. Vacant Street
2. Road of Riches
3. Hospital Area
Northern Shelter
4. Gamers Row
5. Dilapidated Spa House
6. Drinkers Path
7. Ruined (something?)
8. Ghost Bizarre

The Ghost Bizarre is the end goal because that's where you fight Manduk the Merchant and receive the OKSAE item. I also wanted to note that there is the [Ghost Bizarre] Codex located in the musical room (to the left side of the room, on a table) and there is a Blue chest (to the right side of the room that contains the Carbon Suit). The Ghost Bizarre location is different than the previous streets because your Ghost Gauge doesn't raise like it normally does, giving you the opportunity to search every room at your leisure. I believe you have to go to each room before your party discovers the "vents" which you can then travel to the rest of the map. After discovering the vents:

Med Chest
Take the left vent in the barrel room (Take door from the map room, take the door to the right to the music room, take the door to the far right, now you are in the barrel room. Take the vent to the far left. You'll be in the Maid Room. To the right of the bed will be a chest filled with 2x Herbal Balm, 2x Med Pouch, 1 Light Ration.

Wine Room/Campfire
Get back to the Music room and take the vent into the Wine Room. This is the only campfire you have before you fight Manduk so heal up to full health as much as you can with items!!! Take the vent to the far right and keep going until you run into Gerrard who will give you a key to the room to fight Manduk.

Manduk Fight
Focus all attacks on Manduk. Don't worry about any of the other wraiths. Manduk has an ability where she will heal herself 7+ so she'll do that throughout your fight. Just keep attacking until she dies and the rest of the wraiths die immediately with her.

I managed to come out of the fight with my team's stats as (and order from left to right/Position 4 to 1):
Lyric: 14/17 health, 14/14 vigor
Niels: 1/22 health, 16/17 vigor (WITH A fur vest on)
Amber: 22/24 health, 16/18 vigor
Tristan: 5/26 health, 19/19 vigor

The achievement will pop after you defeat Manduk!

This is unlocked for traveling through five neighborhoods in the entertainment district, navigating the dungeon, and defeating the boss.