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If not us, then who? is a Genshin Impact Wonders of the World Achievement that can be obtained by collecting The Fatui’s Letters in The Chasm. It’s tied to a hidden exploration objective seeking four of the Fatui action logs, which also give you more context on the fate of the people trapped in The Chasm’s underground mines.
Before starting, make sure you have access to The Chasm: Underground Mines, which unlocks after completing The Chasm Spelunkers world quest.
Where to find all Fatui action logs in The Chasm in Genshin Impact
For the hidden achievement called If Not Us, Then Who? to obtain, you must read four Fatui Action Logs scattered throughout The Chasm’s underground mines every order. You will not receive any quest items or indicators of your progress.
Fatui Action Log: Part I
Head to the southern teleport waypoint in The Chasm: Main Mining Area. You will immediately discover a cave that will take you further southwest where the arrow in the image above is pointing. Follow the path until you see a huge clearing.
You will spot the iconic Fatui tent all over Teyvat. Approach him to find two crates on his left. Interact with the glowing spot on the box on the far left to read the Fatui Action Log: Part I.
Fatui Action Log: Part II
Head to the Teleport Waypoint northeast of Stony Halls. In front of you you will find a huge crater. Your goal is to slide to where the arrow is pointing in the image above, which is essentially the southwestern part of the map (don’t jump into the crater).
Once on the other side, follow the path to the area guarded by a Pyro Abyss Mage. You may have to defeat it as you cannot interact with objects when it is targeted by an enemy. You will also find a lot of Oozing Concretions in it.
Continue into the room where you will find a Box with a glowing spot. Interact with it to read Fatui Action Log: Part II.
Related: How to complete A Company Vanishing into the Deep World quest in Genshin Impact
Fatui Action Log: Part III
Go to the Teleport Waypoint south of the Underground Waterway, then slide to the cracked wall pointed by the arrow in the image above.
Follow the path forward until the shallow water associated with the waterfall is visible. You will see that there is a hidden path under the broken path. Go under it and follow the path until you reach a dead end.
You will find one glowing spot next to some debris. Interact with it to read Fatui Action Log: Part III.
Fatui Action Log: Part IV
The last log is the easiest to find. Go to the teleport waypoint in The Glowing Narrows and continue walking straight towards the area marked on the map above. You will find an abandoned one Fatui camp with a glowing spot. Interact with it to read Fatui Action Log: Part IV.
For more Fatui-related objectives in The Chasm, check out our guide on how to trigger and complete the Lost in a Foreign Land World Quest chain in Genshin Impact here in Pro Game Guides.
https://progameguides.com/genshin-impact/how-to-get-the-if-not-us-then-who-hidden-achievement-in-genshin-impact/ How do you get that If not us, then who? Hidden achievement in Genshin Impact