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