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