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