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