Full list of all 10 Dauntless achievements worth 1,000 gamerscore. It takes around 150-200 hours to unlock all of the achievements on Xbox One.
Defeat a Behemoth with Every Part Broken
Craft a Weapon from Behemoth Parts
Cook an Epic Cell with the Middleman
Complete 100 Perfect Dodges
Slay a Frostback Pangar
Defeat Shrowd and Rezakiri
Reach Player Level 40
Reach Max Level on a Hunt Pass
Possess a +10 Sword, Axe, Hammer, War Pike, and Chain Blades
Complete any Mastery Card