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