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