Full list of all 50 Foregone achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox One.
Ascend to a secret location with Wall Climb
Discover the Warden's plan
Acquire all Abilities
Defeat Project Poseidon
Learn the truth of the Arbiters
Acquire all Catalysts
Acquire all Skills
Defeat Calagan's First King
Defeat Project Demeter
Complete a branch in the Skill Tree
Defeat Tecton
Acquire a Skill Upgrade
Reminisce at the Courtyard
Defeat Project Hera
Discover a secret location
Destroy the Buzzbot
Damage 4 enemies with one Surge
Speak to the Ferryman
Acquire a Catalyst
Heal with Restoration in mid-combat
Acquire a collectible
Upgrade an item
Allocate Essence into the Skill Tree
Complete the Prologue
Defeat the revived Project Hera
Defeat the revived Project Demeter
Defeat the revived Project Poseidon
Defeat Project Zeus
Damage 8 enemies with one Nova
Kill 5 enemies with a single use of Overdrive
Kill 10 enemies before Barrier's duration runs out
Damage 6 enemies with one Raze
Defeat an elite enemy inside Bastion
Uncover a secret location with Ground Smash
Discover all secret locations in a level
Discover all secret locations
Upgrade a Mythic item to Level 5
Equip a Mythic item in each active slot
Acquire all Skill Upgrades
Acquire all Commander's Logs
Acquire all Lab Notes
Acquire all Military Reports
Acquire all Diary Pages
Acquire all collectibles
Complete a branch in Skill Mastery
Max all possible nodes in the Skill Tree
Max all possible nodes in Skill Mastery
Kill Project Zeus
Spare Project Zeus
Complete all Achievements