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