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