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