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