Pillars of Eternity 2: Deadfire - Ultimate Edition

From WhiterValkyrie in the Xbox guide:
This achievement is tied to the quest "Seeker, Slayer, Survivor"(originally the second DLC of the game).

In the Crucible, you will meet a man named Engari. He will be giving you tasks to find certain artifacts. There are four artifacts for each face, for the total of twelve. You need to find and collect all of those artifacts to unlock the achievement.

The first three are story related and are on the island.

The second batch of three are unlocked after you finish at least one challenge (unlocked tasks: The Surviving Face’s Hunt for the Matron’s Skull, The Slaying Face’s Hunt for the Luckless Coin, The Seeking Face’s Hunt for the Adra Pearl).

The third batch for each face is unlocked after you finish at least two challenges for that face (unlocked tasks: The Surviving Face’s Hunt for the Uncut Gem, The Slaying Face’s Hunt for the Titan’s Heart, The Seeking Face’s Hunt for the Fortuneteller's Ear).

The final batch of tasks is unlocked after you finish Battle Royale and the events that come after, so basically after the DLC story-line ends (unlocked tasks: The Surviving Face’s Hunt for the Finger of the Exiled Queen, The Slaying Face’s Hunt for the Hunter’s Head, The Seeking Face’s Hunt for the Haemneg’s Handmaiden).

(Photo are from De fabula_rasa on Steam, credit to him)

SEEKER ARTIFACTS

Adra Pearl
Location: Neketaka, Old City
Enter the Old City Overlook through the lift in the Gullet. Head down to the second level of the Old City, the very flooded one. Look in the water near a big boulder and stairs at the centre of the map.

https://steamuserimages-a.akamaihd.net/ugc/95409195191435895...

Predictor’s Ear
Location: Neketaka, Periki’s Overlook, The Dark Cupboard
You will find Predictor in the upper right corner of the shop. Interact with it (him?) and take his ear.
https://steamuserimages-a.akamaihd.net/ugc/95409195191436056...

Haemneg’s Handmaiden
Location: Dunnage, Radiant Court, Treasure Trove
Tapestry is in a small storage room that you see immediately after entering the shop. It’s considered stealing to take it, so be sneaky and beware the guard standing outside that room.
https://steamuserimages-a.akamaihd.net/ugc/95409195191436056...


SLAYER ARTIFACTS

Luckless Coin
Location: Island Maje, Port Maje Harbor, Kraken’s Eye
There is a man seating to the left of the bar. Talk to him to find out about his curious coin. He is unwilling to part with the artifact. You can chose to order some rum and drink him under the table to take his coin after he passes out.
https://steamuserimages-a.akamaihd.net/ugc/95409195191435994...

Titan’s Heart
Location: Neketaka, Brass Citadel, Fleet Master’s Office
You will find the artifact in a chest to the right side of the entrance.
https://steamuserimages-a.akamaihd.net/ugc/95409195191436112...

Hunter’s Head
Location: Motare o Kōzi
In the north-west part of the location, just below the big ancestral tree, the is a headless statue of a stelgaer. You will find the artifact right next to it, to the right. It's not highlighted very well, so just search around with your cursor.
https://steamuserimages-a.akamaihd.net/ugc/95409195191435966...

SURVIVOR ARTIFACTS

Matron’s Skull
Location: Neketaka, Sacred Stair, The Hanging Sepulchers on the Temple of Berath
You will find the artifact in the northern part of the location, near bunch of stone slabs with skeletons on them.
https://steamuserimages-a.akamaihd.net/ugc/95409195191436027...

Uncut Gem
Location: Poko Kohara Ruins
There is a big solitary palm tree near a small pond in this area. You will find the artifact next to it.
https://steamuserimages-a.akamaihd.net/ugc/95409195191436141...

Finger of the Exiled Queen
Location: Oathbinder’s Sanctum
The Sanctum is on a small island just south of Neketaka. You need to head to the last level of the Sanctum where you will find a big statue of Woedica. The finger of this statue is your artifact.
https://steamuserimages-a.akamaihd.net/ugc/95409195191436085...