Borderlands 4のサイドミッションは、Vault HunterがKairosの混沌を完全に体験するために欠かせない要素です。複数の地域にわたって計93のサイドミッションが存在し、それぞれのクエストではVault Hunter Stylesや武器スキン、車両ペイント、コスメティックヘッドなどのユニークな報酬が用意されています。

The Fadefields

Coastal Bonescape

• Meat is Murder - 報酬: Tropic of Cairn (Vault Hunter Style)
• Abduction Injunction
• Hangover Helper - 報酬: Soused (Vault Hunter Style) x2

Hungering Plain

• No Place Like Home - 報酬: Crimson Takeover (Vault Hunter Style), Crimson Takeover (ECHO-4 Paintjob)

The Low Leys

• Exit Through the Rift Shop - 報酬: Absolute Astra (Vault Hunter Style)

The Howl

• Ready to Blow - 報酬: Taste Municipality (Vault Hunter Style, ECHO-4 Paintjob)
• Breeding Daisies - 報酬: It’s Threshy! (Vault Hunter Head)
• Whack-A-Thresher
• Carried Away
• Droning On
• Drone Ranger
• The Kairos Job - 報酬: Smiley (Weapon Skin)
• Scoundrel Roundup: Glitch
• Scoundrel Roundup: Kilo
• Free for the TASKing
• TASK and Ye Shall Receive
• TASK Master
• Working For Tips
• Null and Void - 報酬: Out of Bounds (Vault Hunter Style)
• All Charged Up - 報酬: Out of Bounds (ECHO-4 Paintjob)
• Bound for Launch
• PowerDrop
• Savage Salvage

Idolator’s Noose

• Sum of His Parts - 報酬: Bargain Hunter (ECHO-4 Paintjob)
• Electroshock Therapy
• Electroshock Therapy: The Second Session

Dissected Plateau

• Gone Are My Leggies - 報酬: Halt, Citizen (Vehicle Paint Job)
• To the Limb It
• To the Limb It: Redux
• To the Limb It: Couples Therapy
• Primordial Vault: Fadefields

Carcadia Burn

Lopside

• Potty Mouth - 報酬: ECHO-IVIV (ECHO-4 Frame)
• Imminent Jest

Grindstone of the Worthy

• The Power Ballad of Rodd Vomit - 報酬: Trendy Collection (Vault Hunter Head)
• Vicious News Cycle: Cannon Fodder
• Primordial Vault: Carcadia Burn

Ruined Sumplands

• Fault Hunting - 報酬: Eternal Defender (Weapon Skin)
• Vend of the Line
• Enter the Electi Part 1
• Enter the Electi Part 2
• The Council Divided - 報酬: Middle Name “Danger” (Vault Hunter Style)
• A Traitor Within — 報酬: Middle Name “Danger” (ECHO-4 Paintjob)
• The Mole’s Gambit - 報酬: Cursed to Live (Vault Hunter Head)
• PB&J
• Her Own Funeral
• Broken Ships
• Vicious News Cycle: Hot Tag
• Vicious News Cycle: Mine Time Live

Tonnage Peel

• And Welcome to the Jam
• Ripples and Rituals

Terminus Range

Hungering Plain

• Finway’s Cup

Cuspid Climb

• Flat Kairoser - 報酬: Flat as a Fritter (Vault Hunter Style, ECHO-4 Paintjob)
• Peak Performance
• Wayward Gun - 報酬: Loyal Customer (Vault Hunter Style, ECHO-4 Paintjob)
• Way Too Chill

Stoneblood Forest

• Father of the Glide
• Crack This Guy’s Back
• Sage Against the Machine
• The Next Quest Thing

The Low Leys

• Mob Mentality - 報酬: Claver (Vault Hunter Style)
• Mob Rules - 報酬: Claver (ECHO-4 Paintjob)
• Angry Mob - 報酬: More Human (Vault Hunter Head)
• Mob Justice - 報酬: Criminal Enterprise (Vault Hunter Head)
• Tandem Access Memory
• La-La-Last Call
• Ain’t No Sham in It
• Brew-ha-ha
• Never Meet Your Heroes
• The Importance of Being Furnished
• A Brother in Need
• It’s a Whole Phase Situation - 報酬: Earned Your Stripes (Vault Hunter Style)
• Returned to the Mountain
• A Call for Help
• Primordial Vault: Terminus Range

Dominion

Carcadia District

• Price of Freedom
• Price of Freedom Pt. 2
• Price of Freedom Pt. 3
• Joe & Sue
• The Black Market
• Overwriting a Wrong
• Bad Seed
• Bad Seed Pt. 2
• The Cat’s Pajamas

Terminus District

• AAA for Effort
• Below the Surface
• No-Escape Room - 報酬: Eternal Defender (Vehicle Paint Job)
• Love in the Time of Eridium Poisoning

Fades District

• Old Raymond
• Old Lads
• Old Tricks
• One Gassy Issue
• One Slimy Issue

ほぼ100のサイドミッションがKairosに広がっており、Borderlands 4はシリーズの中で最も多様な体験を提供します。伝説的な戦利品を追い求めたり、ユーモアあふれるクエストラインを楽しんだり、コスメティック報酬を集めたりと、これらのサイドミッションをクリアすることで、エンディング後も長く楽しむことができます。