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