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