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