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