Full list of all 78 The Witcher 3: Wild Hunt achievements. It takes around 100-120 hours to unlock all of the achievements in the base game on Windows.
The base game contains 52 achievements, and there are 3 DLC packs containing 26 achievements.
Kill 3 opponents in one fight using 3 different methods (swords, bombs, crossbow, Signs, etc.).
Destroy all monster nests in the Velen / Novigrad region, or in Skellige.
Win all the horse races in the game.
Finish the game on any difficulty.
Defeat Eredin.
Complete all fistfighting quests in Velen, Skellige and Novigrad.
Reach character development level 35.
Complete all witcher contracts.
Defeat Tybalt and win the gwent tournament held at the Passiflora.
Defeat Olaf, the Skellige champion of unarmed combat.
Complete the contract on Morvudd.
Fill all mutagen slots.
Visit Tir ná Lia and convince Ge'els to betray Eredin.
Take part in the assassination of King Radovid.
Find and equip all the elements of one set of witcher gear.
Find Ciri.
Complete the subplot about choosing Skellige's ruler.
Kill 50 opponents using the environment (e.g. swamp gas, insects or objects).
Destroy 10 monster nests using bombs.
Complete the contract on the Woodland Spirit.
Discover 100 fast travel points.
Complete the contract on Therazane.
Help Yennefer extract information from Skjall's body.
Find and free Dandelion.
Resolve the doppler problem in Novigrad.
Complete the contract on the shrieker.
Kill 2 monsters you have a contract on without using Signs, potions, mutagens, oils or bombs.
Complete the subplot involving Keira Metz.
Collect the formulae for 6 different bomb types.
Find the baron's wife and daughter.
Defeat an opponent in a fistfight without taking any damage.
Read 30 books, journals or other documents.
Kill at least 5 opponents in under 10 seconds.
Learn 12 potion formulae.
Kill 5 foes in a fight without taking damage (except for Toxicity) and without using the Quen Sign.
Find Yennefer of Vengerberg.
Finish the game on the "Blood and Broken Bones!" or "Death March!" difficulty levels.
Finish the game on the "Death March!" difficulty level.
Bring all possible allies to Kaer Morhen for the battle against the Hunt.
Acquire all the Abilities in one tree.
Use the Axii Sign to force one opponent to kill another. Do this 20 times.
Kill 10 opponents by knocking them off somewhere high with the Aard Sign.
Perform 10 effective counterattacks in a row without getting hit or parrying.
Ignite the gas produced by a Dragon's Dream bomb using a burning opponent. Do this 10 times.
Make an opponent suffer from bleeding, poisoning and burning simultaneously. Do this 10 times.
Kill 50 human and nonhuman opponents by striking them in the head with a crossbow bolt.
Attack, counter, cast a Sign and throw a bomb (in any order) in under 4 seconds.
Acquire all gwent cards available in the base version of the game.
Have all possible Place of Power bonuses active at the same time.
Win a round of gwent using only neutral cards.
Play three hero cards in one round of gwent and win the match.
Complete the contract on Sarasti.
Defeat all the fallen knights and loot their campsites.
Finish the "Hearts of Stone" expansion.
Kill the prince cursed into a toad.
Participate in all the activities at the wedding.
Buy all the items put on the block at the Borsodis' Auction House.
Recreate all of Iris' nightmares in the Painted World.
Provoke all Iris von Everec's Nightmares into fighting you at the same time and defeat them.
Kill 3 opponents with their own arrows.
Be under the influence of seven potions or decoctions at the same time.
Collect all available Ofieri armor and horse gear, and at least one Ofieri sword.
Kill 20 cows.
Slide downhill uninterrupted for at least 10 seconds.
Win a round of gwent with a total strength of at least 187.
Be decorated with the Order of Vitis Vinifera.
Find all grandmaster diagrams for each witcher school.
Be given Aerondight by the Lady of the Lake.
Develop a mutation.
Use all available options for developing Corvo Bianco.
Collect all the cards in the Skellige deck.
Unlock the bonus for equipping all the witcher gear elements from one School.
Travel to the Duchy of Toussaint.
Serve time in Toussaint.
Obtain a flawless victory in all the competitions during the knights' tourney.