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