Atomfall Walkthrough#

First Things First: There Is No Numbered Quest List#

Atomfall doesn’t structure its campaign as “Quest 1, Quest 2.” It’s a clue-driven nonlinear open world: you play an amnesiac who wakes up inside the quarantine zone, and you gather leads by answering phones, reading documents, overhearing conversations, and examining scenes — then follow whichever lead chain you choose toward an ending.

That means two things:

• There’s no canonical route. Two players can experience the same content in completely different orders. The stage breakdown on this page is a skeleton organized around how most lead chains depend on one another, not a mandatory sequence.
• There’s no precise completion-time table. How deeply you explore, how often you fight, and how much you wander will stretch or shrink the campaign dramatically. This page only gives order-of-magnitude estimates — your own run is the real benchmark.

Walkthrough Overview#

Rough Time Investment#

Because Atomfall is strongly nonlinear and its lead chains interlock, the numbers above are ballpark figures only: a player pushing a single route as fast as possible will finish sooner, while anyone chasing full collection and side investigations will take longer. Actual values vary a lot with patches and playstyle — treat your in-game progress as the authority.

How to Use the Clue System#

Whether you glide through or keep stalling comes down to how well you use the clue panel:

Universal troubleshooting when stuck: replay the most recent phone lead, reread entries you marked secondary on the clue panel, and check map regions you haven’t set foot in yet. The game has almost no “level-gated” walls — being stuck almost always means you’re missing a lead or a key, not missing XP.

Stage 1: Prologue — Waking Up in the Bunker#

You open the game waking in an abandoned bunker (Bunker L7) beneath Slatten Dale.

• One objective only: loot the bunker, grab a flashlight, a basic melee weapon, and starting supplies, then head back to the surface.
• There’s no combat test inside the bunker. The point is getting comfortable with movement, sneaking, looting, and inventory management.
• Near the exit you pick up several of the most important items in the entire game: a melee weapon, basic consumables, and the tools that let you start looting and crafting.

Once you’re on the surface, don’t sprint for the horizon: Slatten Dale itself is the first tutorial ground. Enemies behind cover, lootable buildings, and your first phone box are all dotted around here. Walk the dale end to end and bank your first stash of supplies for the journey ahead.

Stage 2: Early Game — Phone Leads and Village Investigation#

This stage is the campaign’s “network-building” phase. Three things deserve priority:

Answer the “Oberon” Call#

Early on you’ll receive a mysterious call, and the name “Oberon” appears for the first time. That call is the anchor of the entire main thread: a huge share of later leads point at it from different angles. Build the habit of stopping to answer every phone box you come across — the main storyline is strung together by phones more than anything else.

Explore Slatten Dale and Wyndham Village#

• Slatten Dale: an open surface area, ideal for practicing your sneaking and looting rhythm, and dense with supply points.
• Wyndham village: the most important settlement of this stage — merchants, skill trainers, and the meeting point of several leads. Talk to everyone you can before you start working through the buildings’ documents and supplies.

The St. Katherine’s Church Murder Investigation#

St. Katherine’s Church in the village hides a complete murder-investigation lead chain: survey the scene, compare testimonies, and follow the evidence forward. The big reward for finishing this line is the crafting manual — it directly expands what you can make, which makes it one of the highest-value early leads.

Early-game exit checklist:

• Answered at least one Oberon-related call
• Swept Wyndham’s merchants and dialogue leads
• Pushed the church murder line until you have the crafting manual
• Have a steady source of skills manuals (prioritize picking them up while exploring)

Stage 3: Mid Game — Opening the Interchange#

The hub chapter of the campaign: you enter a vast underground facility called the Interchange, the transport core linking every part of the quarantine zone.

Power the Four Data Stores#

The core mechanism inside the hub is four data stores labeled Alpha, Bravo, Charlie, and Delta. Each one needs a battery inserted to power up:

• Batteries are scattered through the hub and the surface zones — treat them as high-value “always pick up” loot.
• Once powered, each store’s terminal releases key intelligence that pushes the Oberon mystery another layer deeper.

Find the Signal Redirector#

Pinpointing the Oberon signal requires the Signal Redirector, and the related leads and equipment run through Skethermoor and Brinsop Manor:

Unlock the Zone Connections#

Once the Interchange is back online, connections between the quarantine zone’s regions open up one by one. From here on, exploration is no longer blocked by terrain, and you can order it freely by interest. Tip: every time you power one more data store, return to the surface and sweep the newly unlocked direction for a double haul of intel and supplies.

Stage 4: Late Game — Oberon Access and the Final Facility#

Once the intelligence is assembled, only one gate stands before the finale: earning access to the Oberon facility.

• The main access thread runs through the Skethermoor side; both the Protocol workshop and the prison lead to the objective, and which one you take depends on which leads you answered earlier and whose side you chose.
• With access in hand you can enter the Oberon facility and face the mystery’s core head-on. Enemy and supply density here are the highest in the game — stock up on ammo, medical items, and backup weapons before going in.

Stage 5: Endings — Six Escape Routes#

Inside the Oberon facility the campaign forks: there are six escape routes, each bound to one of the key presences threaded through the story — the phone voice, Sims, Tanner, Garrow, Holder, and Oberon itself.

A few mechanics-level notes:

• When and where each route’s character shows up depends on the order you picked up leads — that’s this game’s nonlinear nature in action, and there’s no fixed “you must meet X first” order.
• A single playthrough allows only one escape route. To see every ending, manually save before the finale, or take a different lead chain on separate playthroughs.
• For each route’s specific dialogue options and final conditions, trust the in-game clue panel and on-site prompts — we won’t list them one by one here to avoid steering you wrong.

Bonus Achievement Objectives#

Beyond a standard completion, two achievements in the list are tightly tied to the campaign’s flow:

Both achievements reward knowing the flow: finish one normal-paced run first, memorize the key beats, and a dedicated speed-exit save becomes far smoother. Achievement descriptions may shift slightly with patches — the in-game list is authoritative.

Stuck? Quick Troubleshooting#

Related Pages#

• Quest Guides — a finer breakdown of leads and tasks
• Skills System — how to get skills manuals and where to spend points
• Crafting System — crafting manual and recipe details
• Secrets — stashes and easter eggs
• Achievements List — conditions for every achievement
• World Exploration — zone details and landmarks