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