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