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