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