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