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