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