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