Full list of all 152 Chronicon achievements.
The base game contains 110 achievements, and there are 3 DLC packs containing 42 achievements.
Acquired the munitions
Secured a base of operations
Freed the Major
Destroyed the abomination
Escaped The Bone Pits
Destroyed the three Guardians
Complete Act 5
Helped the Demon Hunter brothers
Completed all story and optional quests in the Encampment
Complete every optional quest in the game
Find all the Troves in The Final Frontier (Act 5)
Unlocked the Room of Abundance
Explored every Optional area in the game
Killed one of every (non-seasonal) foe in the game
Collected and added 100 Unique or Legendary items to the Codex
Collected and added 200 Unique or Legendary items to the Codex
Collected and added 400 Unique or Legendary items to the Codex
Collected and added 70 Lesser Runes to the Codex
Reached Level 100 as Templar
Reached level 100 as Berserker
Reached level 100 as Warden
Reached level 100 as Warlock
Unlocked Expeditions
Hatched an Egg
Raised a Greater Beast
Obtained a Golden Crystal
Spent 50 Golden Crystals on passive skills in the Expedition Tree
Met an old friend
Met an old foe
Forged an Artifact
Forged all Artifacts available on any character
Forged a Mythical Weapon on the Hellforge
Purchased an Elite Passive Skill in the Expedition Tree
Purchased rank 100 in any Class Passive Skill in the Expedition Tree
Purchased a Perk in the Expedition Tree
Reached level 100 as the Mechanist
Have 4 or more companions as the Mechanist
Have 10 or more Drones as the Mechanist
Have 5 or more Turrets active at the same time as the Mechanist
Obtain all the Anomalous Runes for the Mechanist
As the Mechanist, have fully socketed Legendary equipment in all equipment slots
Forged a Mythical Weapon on the Hellforge as the Mechanist