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