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