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