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