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