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