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