[Main storyline]

Tutorial → Retake the outposts → Hopper round up & Find Newton → GMS expedition → Find the drill parts → Assist Rail Crossing → Look for Cornell → Infiltrate Tchortist ranks → Retrieve the cube → Epilogue

[South Gate Station]

Jack's delivery job • Tissue sample collection • Find Old Jonas's watch • Hungry Eels • Trade document delivery • Battery trouble • Check on Camp Hathor • Missing merchants • Mushroom Cove scavenger • Camera problems

[Junkyard]

Retrieve Kohlmeier's lucky knife • Southern fishing tour • Save Jenny • Info for Abram → Abram's bug → Free Maura

[Black Eels]

Collect Grover's debt → Retrieve the lost cargo → Find Blaine → Get support for Black Eels → Rig the cavern → Gang showdown

[Scrappers]

Get Elwood's key → Find the mysterious disk → Black Eels' route to Old Junkyard • Kill Blaine

[Camp Hathor]

Burrower emergency → Kill the Rathound King • Kidnap Sarine

[Rail Crossing]

Get rid of the Faceless • Save Buzzer • Find EMP device • Train heist • Catch the med thief • Dude's vision

[Foundry]

Foundry murders • Assassinate Olivia/Nicolas • Kill Balor • Faceless recon • Faceless' stolen object • Study the rock creatures → Fix Gloria → Kill the Beast

[Core City]

Become the Invictus • Run the Gauntlet • Find Abram • Meet Gorsky → Recover tunneler & rob Protectorate warehouse → Retake outpost for Gorsky • Find HV cables → HV penetrator ass.embly → Overcharge facility • Ticket testing

Coretech: Find Raul → Retrieve ICPD → Defend warehouse → Seek Acid Hunters → Research facility

JKK: Find Bogdan → Disable warehouse security → Escort Vivian → Seek Acid Hunters → Research facility

Praetorian Security: Kill Joe De Pacino → Sewers generator → Clear warehouse → Seek Acid Hunters → Research facility

[Institute of Tchort]

Return the Reaching Man → Praepostor interview • Strange tremors

Preservation: Secure Utility Station 7 → Find missing combat unit in west wing → Track down Rassophore Nevil

Investigation: Find Rassophore Pavel → Deploy T-ray emitter #1 → Deploy T-ray emitter #2 • Field test XAL-001 & HRO protein research → Drink sampling • Pacify Psycho → Disease-resistant DNA & Forsaken Island Behemoth

[Deep Caverns]

Befriend the Faceless • Get into Cytosine Outpost • Scout Faceless positions • Liberate rassophores • Find Leo's knife • Repair the gate mechanism • Restore Arke powergrid • Open the gate leading to Tchort • Mutagen Puzzle • Destroy Tchort

[Protectorate]

Join the Protectorate → Renegade soldiers • Epione Lab investigation → Find Hephaestus Research → Gas the drones

[Free Drones]

Join the Free Drones → Lurker escape • Get equipment from Junkyard → Sabotage elevator → SRO assault • Reveal spy

[Jack Quicksilver]

Everard's assignment, Meet Lenox Pierce & Meet Ohad Xander → Meet Azif

[Oculus]

Old man Nosek

[Waterways] Expedition DLC 필요

The tracking device • Jet Eater Hunt • Ion's missing group

[Heavy Duty] Heavy Duty DLC 필요

Trip to North Underrail → Escape the Dark Territory, The Gunslinger & Investigate the Compound → Void Battle

[Other]

Tracker necklace • Milton's Key

Quests of Underrail: Expedition DLC 필요

[Dude]

Dude's other quest

[Core City]

Join the Expedition • Meet Aran

[Black Sea]

Expedition without you • Note Cipher Puzzle • Obtain a Submarine

[Black Sea - Expedition]

Defend the island → Recover the A-RFID Chip → Investigate Horticulture Center → Investigate Nexus → Investigate Health Center → Investigate JSHQ → Investigate Abyssal Station Zero • Improve camp defenses • Prevent kidnapping/Rescue the Professor

[Black Sea - Grim Jetters]

Join the Pirates • Unlock Lemurian facilities • Find Salvation • First raid → Second raid → The Rig Attack • Interrogate the Professor → Defend Port Ceto • Hunt down Aegis

[Other content]

Mutant Questline