Here is the full list of all 28 Massive Chalice achievements.
Completed the game on Hard Difficulty
Completed the game on Brütal Difficulty
Completed an IRON game (any Difficulty)
Completed an IRON game (Brütal Difficulty)
Defeated an enemy from the past
Completed the game on Normal Difficulty
Killed 50 or more enemies with one hero
Progressed a Relic to its maximum level
Took at least 3 of your 5 initial Vanguard Bloodlines all the way to the Final Battle
Survived 300 years (Reached year 301)
Deployed a Vanguard with only Cadence Weapons, Armor, and Items
Beat a tactical battle where every hero is over 60 years old
Built a building in every Region
Survived 150 years (Reached year 151)
Deployed a Vanguard of 5 different classes
Killed 5 or more enemies with a drunk hero in one tactical battle
Kill 4 or more enemies with one attack
Beat a tactical battle without taking any damage
Received your first Relic
Adopted multiple children into the same Keep
Survived 50 years (Reached year 51)
Killed an enemy with a Burst Bush
Appointed a Standard
Appointed a Sagewright
Your first hero came of age
The first baby was born
Arranged your first Marriage
Defended your first Keep