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