Genshin Impact's version 2.6 update introduced the Chasm subregion, which offers a huge new area to explore, new quests to complete, new hidden achievements to unlock, and a large amount of Fatui lore hidden throughout exploration and side quests.
One such avenue of learning Fatui lore is in the hidden achievement "If Not Us, Then Who?" This achievement tasks the player with reading four Fatui action logs hidden throughout the Chasm region, each giving a little bit of detail into the organization and their time operating inside the Chasm. This achievement and its 5 Primogems reward are painless to unlock if the player knows where to look and has no known prerequisites outside of being eligible to explore the Chasm.
Finding Fatui Action Log #1 in Genshin Impact
In order to find the first Fatui action log, players should begin by teleporting to the teleport location directly south of "The Chasm: Main Mining Area." From this waypoint, the player should immediately turn around and follow the walkway south, heading up the nearby stairs and eventually ending up right next to a Fatui campsite and tent.
Directly next to the Fatui tent will be two square boxes against the wall, each with a flashing star. The box closest to the player will have a book sitting on top of it, which will be the first Fatui action log. The other box, if interacted with, will drop a small amount of Mora for the player.
Finding Fatui Action Log #2 in Genshin Impact
The second Fatui action log can be a bit misleading if looking at the above map, as one would assume they should teleport to the point in the middle of Stony Halls. However, players should actually teleport to the teleport point at the top-right of Stony Halls instead, and from here, directly follow the path until reaching a small enclosed ruin with a Pyro Abyss Mage and a spider inside.
Players will likely need to defeat the Abyss Mage, as it will prevent reading the Fatui log through combat otherwise. The second Fatui action log is sitting on a box to the left of the spider web.
Finding Fatui Action Log #3 in Genshin Impact
The third Fatui action log will require players to teleport to the teleport point located in the Underground Waterway. As the location name implies, this teleport point plops the player onto a platformer overlooking a small waterway, which the player should then jump into and follow.
Eventually, the player will come across three Hilichurls dancing at a wall, which is an indication that the player should turn right next to them, looking directly at a destroyed ruin full of water. Swimming inside the water-filled ruin and looking to the left will reveal a small cooking pot on a ledge, and right next to it will be the third Fatui action log lying in rubble from the destroyed wall.
Finding Fatui Action Log #4 in Genshin Impact
Finding the final Fatui action log is another straightforward one, simply requiring the player to teleport to the teleport point in the center of The Glowing Narrows. From here, head straight and follow the path until reaching a small Fatui camp in the tunnel.
The fourth and final Fatui action log will be sitting on a pile of books, sparkling for the player to read it. Upon reading the final action log, the player should be awarded the "If Not Us, Then Who?" Achievement, awarding 5 Primogems and a better understanding of what happened to the Fatui inside the Chasm.
Genshin Impact is now available on Mobile, PC, PS4, and PS5. A Switch version is in development.