Here is the full list of all 49 Hades achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Max-rank each standard Keepsake
Reach the epilogue of the story
Earn all Chthonic Companions
Fulfill the 'Divided by Death' Prophecy
Purge a Legendary Boon
Fulfill the 'Harsh Conditions' Prophecy
Trade 20 times with the Wretched Broker
Fulfill the 'Night and Darkness' Prophecy
Unlock each standard Keepsake
Clear Elysium with the 'Extreme Measures' Condition
Use an Olympian's Greater Call against them in a Trial
Get 30% bonus damage with the Pierced Butterfly
Fulfill the 'War-God's Bloodlust' Prophecy
Beat Thanatos by 15 kills or more
Complete the main quest in the story
Buy 9 'Well of Charon' items in one escape attempt
Earn a Loyalty Card
Fulfill the 'End to Torment' Prophecy
Have at least one rank in each Mirror of Night Talent
Clear an escape attempt with a hidden Weapon Aspect
Clear an Infernal Gate without taking damage
Unlock all Weapon Aspects
Pet Cerberus 10 times
Catch a fish from each region
Use Greater Call to invoke an Olympian's aid
Get 20% dodge chance with the Lambent Plume
Choose 100 different Olympian Boon effects
Choose 50 different Daedalus Hammer enchantments
Clear Elysium
Forge a bond with any character
Clear Asphodel
Unlock each of the Infernal Arms
Pay for 50 jobs from the House Contractor
Fulfill any 15 Prophecies
Fulfill the 'Musician and Muse' Prophecy
Compel Orpheus to sing again
Fulfill the 'Chthonic Colleagues' Prophecy
Equip a Chthonic Companion
Slay Skelly 15 times
Earn access to and enter the Administrative Chamber
Earn the first of Skelly's prizes
Max any Weapon Aspect
Clear an escape attempt
Fulfill the 'Master of Arms' Prophecy
Earn the second of Skelly's prizes
Fully Unlock the Olympians' Codex entries
Clear Tartarus
Fulfill the 'Slashed Benefits' Prophecy
Fulfill the 'Dark Reflections' Prophecy