Three checks that prevent a short count

Pause at these Act 3 transitions[2][3]
  1. EARLY

    Before the downhill drop

    Find the COG Army Knife beyond the first mauled camper.

  2. OPTIONAL

    Last Foothold’s final side mission

    Check the rooftop ammunition area for Blade-like Projectiles.

  3. BOUNDARY

    Fort Vigil truck

    Commander’s Letter Home still counts toward Act 3.

These landmarks combine Gameswelt, The Nerd Stash and GamersBeacon. GSC places the letter by Fort Vigil’s red-light truck in Chapter 3.6; Nerd describes it at Act 4’s start. Check the landmark across this transition.[1][2][3][4]

Chapter 1 — Stranded · 5 collectibles

0 / 5 completed

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Woods and airfield[3]
DoneItemLandmark
COG Army KnifeTrees beyond first mauled camper; before downhill drop.
Fairlight Rifle Range SignPerimeter fence by the tank.
Gut-Puncher Grenade RoundsFirst Supply Cache vehicle.
UIR Soldier Shooting TargetHelipad substation: fence/machinery.
Prepper’s Scavenging MapSubstation entrance: between generators.

Chapter 2 — Enemy Lines · 6 collectibles

The Nerd Stash gameplay screenshot labeling Erick Davis’s COG Tags in the sewer area
Credit: The Nerd Stash. The labeled sewer pickup is the sixth Enemy Lines collectible, Erick Davis’s COG Tags.[2]
0 / 6 completed

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Underground route[1][3]
DoneItemLandmark
Damaged Gnasher ShotgunSide tunnel: blue military cases.
Parchment and Powder PouchFirst Locust camp: supplies.
Parchment with Indecipherable WritingOld subway: below rear stairs.
COG Tags — Private Beth AvilaRed-lit branch behind wrecked train.
Maintenance Worker’s Bloodied FlashlightOpposite-track tunnel.
COG Tags — PFC Erick DavisLarge sewer basin: by Supply Cache.

Do not stop at five: the Erick Davis pickup is included by Gameswelt and GamersBeacon after the underground army encounter. The Nerd Stash shows its name and screenshot without written directions; the other routes supply the sewer-basin landmark.[1][2][3]

Chapter 3 — Last Foothold · 14 collectibles

The Nerd Stash gameplay screenshot labeling Blade-like Projectiles at an ammunition area
Credit: The Nerd Stash. The labeled Blade-like Projectiles pickup belongs to the final Last Foothold secondary-objective route.[2]
0 / 7 completed

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City return, outpost and hospital[3]
DoneItemLandmark
COG Tags — SFC Robin HamillCity return: large glowing E-Hole.
COG Tags — Corporal Tracy MooreDestroyed apartment: rear room.
Colonel Trench’s VIP ListCOG outpost: tent desk.
COG Tags — Private Luis GarciaUphill military tent behind outpost.
Captain Grey’s Field JournalField hospital: computer desk.
Landa Memorial Hospital Evacuation OrderCleared emergency reception: whiteboard.
COG Tags — Specialist Rachel CarnahanER upper floor: vending-machine doorway.
0 / 7 completed

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City sweep and optional objectives[1][2]
DoneItemLandmark
COG Tags — Private Terrance SanderPolice rescue: entrance/loading bay.
COG Tags — Private Oded BayBloodied fountain.
Locust Pistol AmmunitionRiverside: dead Locust.
COG Tags — Specialist Bernard HavelockDamaged monorail: climb vehicle hood.
COG Tags — PFC John CarnahanOutside southeastern Shelter 05 walls.
Damaged Heavy Locust HelmetLost in the Park: west-gate Boomer.
Blade-like ProjectilesRooftop Mayday: rooftop railing, beside ammunition box.

Search both secondary-objective routes for the final two entries. The side mission reward and the lore collectible are separate pickups.

Rooftop ammo box: 25:40.[5]

Chapter 4 — The Convoy · 3 collectibles

0 / 3 completed

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Road and bridge[1][2]
DoneItemLandmark
COG Tags — Private Rudy BartholomewFirst fight: left lane’s burning vehicle.
Locust CrestBridge: crashed police car.
COG Tags — Corporal Kevin GarborCentral bridge control-room floor.

Chapter 5 — Desperate Times · 5 collectibles

0 / 5 completed

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Apartments to tower[2]
DoneItemLandmark
Bottle of Iron Coast BeerFirst apartment: right room’s sofa.
Portrait of Chairman Jacob MonroeAfter hallway Wretches: left crawl opening.
Sanctum of the Fallen Memorial Ceremony ProgramRooftop planter.
Locust Spiked Shoulder PadStreet-return route: Locust corpse.
Explosive BoltTorque Bow tower’s top.

Chapter 6 — Desperate Measures · 3 collectibles

0 / 3 completed

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Outpost, pursuit and act boundary[1][2][4]
DoneItemLandmark
Torn Flag of TyrusOutpost: far-right blocked tunnel.
Morith Harbor Snow GlobePursuit route: gift-shop desk.
Commander’s Letter HomeFort Vigil: left of the red-light truck, around the act transition.

The chapter split is 5 / 6 / 14 / 3 / 5 / 3. If only the final entry is missing, check Fort Vigil’s truck around the transition to Act 4 before replaying the pursuit.

Sources & further reading

  1. Act 3 collectible chapter counts and landmarksGamersBeacon · October 3, 2026
  2. Act 3 collectible locations with gameplay screenshotsThe Nerd Stash · Julio La Pine · October 1, 2026
  3. Act 3 collectible walkthrough (German; work in progress)Gameswelt · Denis Lucius Brown · October 2, 2026
  4. Firsthand Act 3 collectibles, Hard Cases and secondary objectivesGamer Social Club · Adam “Addy” Stewart · October 2, 2026
  5. Act 3 Hard Cases and secondary objectives: companion gameplay videoOhNoNotAddy · Adam Stewart · October 2, 2026