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