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