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