Here is the full list of all 54 Baldur's Gate 3 achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Multiclass into every class in one playthrough without asking Withers to change your character.
Reign with terror: take control of the Netherbrain and bend the world to your will.
Complete the game in Tactician mode.
Defeat Gortash in Wyrm's Rock without activating any traps.
In the Wyrmway, wait until the dragon is midflight, then knock it out of the sky - KAPOW.
Coat the streets of Baldur's Gate in blood - become an Unholy Assassin of Bhaal.
Defeat the Apostle of Myrkul before it consumes any Necromites.
Break out of prison after being arrested - aren't you daring?
Defeat the Toll Collector without her using gold against you - excellent budgeting.
Kill the Surgeon before he performs surgery on you in combat.
Pet Scratch and the Owlbear cub at the same time - the greatest joy an adventurer could ask for.
Recruit a hireling. You can befriend them or use them as cannon-fodder - we won't judge.
Kill the Adamantine Golem without using the Forge Hammer.
Find and summon the quasit Shovel. Or is her name... Fork? Maybe Basket?
Play fetch with Scratch - the best boy in the Realms.
Defeat Commander Zhalk in the Nautiloid.
Finish the game (with a heartfelt 'thank you!'' from Larian Studios).
Save every tiefling refugee you can throughout the game in a single playthrough.
Save the day: kill the Netherbrain and destroy the Absolute tadpoles.
Kill the Red Dragon in the Upper City.
Kill Orin while her cultists are performing their ritual chant.
Long Rest using only alcohol - a time-honoured dwarfish tradition.
Romance the Emperor.
Go on a date with Karlach - now that's playing with fire.
Break Wyll's Pact with Mizora.
Leave Act Two - Baldur's Gate is just over the horizon.
Gift Shadowheart a night orchid - her favourite flower. Always knew she was a softie.
Craft an item in the Adamantine Forge.
Rescue all the prisoners from the depths of Moonrise Towers in one playthrough.
Successfully use Detect Thoughts to pry into someone's thoughts.
Ally with Voss against the Githyanki God-Queen. Good luck.
Steal the Blood of Lathander from underneath Rosymorn Monastery.
Read 100 different books in a single playthrough. Adventuring isn't just daring quests, you know.
Stablise Gale's Netherse orb.
Leave Act One - for somewhere altogether darker.
Consume a parasite and unlocked a new power - is it meant to wriggle the whole way down?
Complete ten background goals in a single playthrough - you are one with your character.
Create three unique alchemical solutions in a single playthrough - bottoms up!
Dig up five buried chests in a single playthrough - treasure!
Take four full long rests in a single playthrough - adventuring's tiring work.
Let Astarion bite you - ouch.
Perform five attacks in one turn. Your enemies won't know what hit them (literally).
Kill a creature with falling damage.
Take control of the Nautiloid and escape the hells.
Claim your Throne of Blood: take control of the Netherbrain for Bhaal and break the world.
Make the ultimate sacrifice: become a mindflayer to defeat the Netherbrain.
Rescue Sazza from the Emerald Grove, Goblin Camp, and Moonrise Towers in one playthrough.
Use one enemy as an improvised weapon against another.
Earn a hundred gold from playing sweet, sweet music in a single playthrough.
Kill a character with an unarmed strike.
Kill the Spider Matriarch before her eggs hatch - why do they have so many legs?
Defeat twenty opponents while a party character is drunk in a single playthough - down them.
Become Bhaal's ultimate weapon - become his Slayer.
Complete the game in Honour mode.