Full list of all 46 Dauntless achievements worth 2,000 gamerscore. It takes around 150-200 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 10 achievements worth 1,000 Gamerscore, and there are 13 DLC packs containing 36 achievements worth 1,000 Gamerscore.
Reach Mastery Slayer Level 40
Defeat Shrowd and Rezakiri
Reach Mastery Level 10 in 7 weapons
Reach Max Level on a Hunt Pass
Complete any Mastery Card
Slay a Frostback Pangar
Complete 100 Perfect Dodges
Cook an Epic Cell with the Middleman
Craft a Weapon from Behemoth Parts
Defeat a Behemoth with Every Part Broken
Build a Loadout with 6 Different +6 Perks
Emerge Victorious from a Trial
Hit a Behemoth with Titan's Crash while Tempest Form and Karma Breaker Effects are Active
Defeat Tempestborne Stormclaw with a War Pike
Craft any Blaze Aether Strikers
Craft and Bond a Legendary Weapon
Slay Malkarion with a Terra Weapon
Complete an Escalation
Reach Level 25 in any Escalation
Craft a Weapon or Piece of Armour from Torgadoro Parts
Slay Flameborn Rezakiri
Slay Thrax with the Hammer, Sword, and Chain Blades
Make 25 Discoveries
Slay Agarus with a Shock Weapon
Slay a Sporestruck Charrogg and a Sporestruck Embermane with the Parasitic Perk Equipped
Craft an Exotic Weapon or Armour Piece
Successfully Complete 10 Island Events in the Hunting Grounds
Reforge a Weapon Skill
Equip a Full Set of Power Surged Gear
Unlock Milestone V on the Slayer's Path
Unlock Milestone XII on the Slayer's Path
Defeat Malkarion, Torgadoro, Thrax, Agarus, Urska, and The Chronovore
Slay Kaltauga, Scourge of the Skaldish Highlands
Discover a Rumour in the Shattered Isles
Craft a Piece of Timeweave Armour
Defeat The Chronovore
Wound an Umbral Behemoth with a Radiant War Pike
Complete a Heroic Escalation
Slay Thunderdeep Drask
Craft and Equip an Omnicell
Slay Five Behemoths on The Blazeworks
Defeat Phaelanx
Craft Repeaters of Every Element
Do 100,000 Total Damage with the Revenant Omnicell
Slay Bloodshot Shrowd
Complete 4 Seasonal Challenges