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