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