Here is the full list of all 97 Divinity: Original Sin 2 achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Fane: Embrace this strange new world
Ifan: Kill Lucian
Fane: Return the Eternals to Rivellon
Submit to the God King
Purge Rivellon of all Source
Share Source with all of Rivellon
Ascend to Divinity
Ifan: Forgive Lucian
Complete the game in Explorer Mode
Complete the game in Classic Mode
Complete the game in Tactician Mode
Share Divinity with The Doctor
Defeated the Kraken
Make a deal with Adramahlihk
Defeat Adramahlihk
Gain entrance to Lucian's Crypt without following the Path of Blood
Successfully walk the Path of Blood
Successfully begin a match in Arena Mode
Successfully begin a Game Master session
Persuade Toyseller Sanders to give you his amulet
The Red Prince: Become the father of dragons
Obtain Anathema
Rescue Arhu
Discover Reimond's Lair
Arrive at Arx
Enter The Arena of the One
Sebille: Serve the Mother Tree
Sebille: Destroy the Mother Tree
Pray at every altar on the Nameless Isle
Sebille: Kill the Master
Convince Alexandar to ally with you
Convince all party members to let you ascend
Enter the Academy
Discover the hidden entrance to the Academy
Arrive at the Nameless Isle
Craft a skill
Use the Curse skill
Awaken the corrupted Ancestor Tree on Bloodmoon Island
Learn of the Council of Seven's location from The Advocate
Escort Saheila outside without fighting the Lone Wolves
Speak to an animal's spirit
Set Gareth on a path of vengeance
Perform successful surgery on Natalie
Unlock your third Source Point slot
Set Gareth on a path of reconciliation
Take the ferry to Bloodmoon Island
Serve Garvan the tainted stew
Become champion of the Driftwood Arena
Help free Mari from the Voidwoken
Kill an enemy using Teleportation
Kill Andras, the necromantic dog
Lockpick your way into Mordus' hidden lair
Destroy every Voidwoken egg in Reaper's Cove
Unlock your second Source Point slot
Receive Dorotya's kiss
Correctly answer all of Crispin's questions
Adopt Peeper
Get caught breaking the law
Meet Meistr Siva
Arrive at Reaper's Coast
Enter the Hall of Echoes
Escape Dallis' siege on the Lady Vengeance without killing every minion
Take command of the Lady Vengeance
Welcome Tarquin to the Seekers' service
Craft a scroll
Defeat Alexandar in Fort Joy
Kill Slane
Kill Radeka
Use your first Source Skill
Remove your Source Collar
Rescue Gareth from Braccus' Armoury
Face a higher power
Equip runes to all of an item's available slots
Arrive at the Sanctuary of Amadia
Shapeshift into every race
Flee Fort Joy for good
Escort the Black Cat out of Fort Joy
Become champion of the Fort Joy arena
Craft a grenade
Gain the Hero tag
Win a persuasion event
Escape the kraken's clutches
Arrive at Reaper's Eye
Perform a successful theft
Force Dallis to retreat from combat in Fort Joy
Escape Dallis' siege on the Lady Vengeance after killing every minion
Learn of the Council of Seven's location from a higher power
Learn of the Council of Seven's location from Malady
Tame Featherfall
Swear to the Covenant
The Red Prince: Kill the Red Princess
Lohse: Embrace your demon
Lohse: Banish your demon
Beast: Assassinate the Queen
Beast: Ally with the Queen
Gain the Villain tag
Complete the game in Honour Mode