List of side quests by region:

Cain's Request
Fragments of The Past
A Walk Through Westmarch
Rift of The Elders
Diamond in The Rough
Tools of The Trade
Trading At The Market
Honorable Rewards
Answers in The East
A Captain’s Need
Bounties Abroad
Docks of Westmarch

Another Sword
Break the Curse
Suspicious Behavior
Sending the Signal
Arcane Secrets
Escaping the Past
A Lost Treasure
Noise from the Well
A Wounded Warrior
Trouble at the Bridge
Almost Dinner
A Giant Dilemma
Love Lost
Rest in Peace

Ravenous Wolves
Hijacked Supplies
The Call of the Woods
Fighting Former Allies
Reunion
Beast in the Woods
The Reckless Scout
The Maddened
Lunar Lupis
Young Hunter
Kidnapped Patrol
Tough Vines
Beheaded
Imprisoned
Demonic Ritual

Loyalty in Question
Desert Vintage
Tomb Robber
Unholy Ascension
Liars and Greed
No Place for Children
Smelted Iron
The Enemy of My Enemy
Specialty Trading
The Origin
A Journey to the Past
External Investigation
A Teacher, A Father
Scepter of Desire
To Tabri

An Astounding Opportunity
Animating Purpose
Crumbling Foundations
The Knowledge-eaters
Tides of Sand
Scorpion's Justice
Fate of the Eradicators
Stonebelly's Cure
Thieves of Comrades
What Skulks Below
Prize Hunter
Purity of Form
In Search of Strength
The Perfect Assistant
Chancel of Iron

The Hermit's Grave
Long Way Home
Toothless William Thorpe
Lord of Terroir
Two Dupes
Broken Compass
Let Us In
Foregone Dreams
Endless Strife
Spoiled Bait
The Leftovers
No Pain
The Cleanse
A Season of Charity
Night Auction

Mastery and Nothingness
Private Nightmares
Vigil for the Khazra
Controlled Burn
Shadows Are Broken Light
Your Money or Your Life
The Bond
Carnivore's Dilemma
More Than Love
Lost Lives
Tomb of the Word
Passing the Torch
Hordes of Horror
Faith's Banner
Free the Damned

Frozen Nightmare
Restless Battle
Embracing Winter
Heart of the Storm
Arrival and Departure
In Direst Need
Icebreaker
Corrupted Altars
Overgrowth
Back to the Roots
Supplemental Warmth
Unusual Cold
Vision of Justice
Blood of the Last Elder
Chilling Bombardment

TBA

Waiting Doom
The Hellfire Core
Damnation's Chosen
Toll of Flames
Visitor From Afar
One Right Choice
All Who Succumb
Blood Lure
Momentary Lapses
Horn of Harmony
Dead Eyes
Whispering Bones
Locally Sourced
Hellstorm
Present Pains