Here is the full list of all 78 The Witcher 3: Wild Hunt - there are Complete Edition achievements worth 2,000 gamerscore.
Find all grandmaster diagrams for each witcher school.
Serve time in Toussaint.
Be decorated with the Order of Vitis Vinifera.
Use all available options for developing Corvo Bianco.
Find and equip all the elements of one set of witcher gear.
Unlock the bonus for equipping all the witcher gear elements from one School.
Defeat all the fallen knights and loot their campsites.
Kill 20 cows.
Help unite the warring vineyards and have a wine named in your honor.
Develop a mutation.
Be given Aerondight by the Lady of the Lake.
Obtain a flawless victory in all the competitions during the knights' tourney.
Kill Golyat with a crossbow bolt to his eye.
Travel to the Duchy of Toussaint.
Finish the "Hearts of Stone" expansion.
Recreate all of Iris' nightmares in the Painted World.
Participate in all the activities at the wedding.
Kill the prince cursed into a toad.
Finish the game on any difficulty.
Reach character development level 35.
Defeat Eredin.
Take part in the assassination of King Radovid.
Visit Tir ná Lia and convince Ge'els to betray Eredin.
Fill all mutagen slots.
Find Ciri.
Complete all witcher contracts.
Complete the contract on Morvudd.
Complete the subplot about choosing Skellige's ruler.
Help Yennefer extract information from Skjall's body.
Kill 2 monsters you have a contract on without using Signs, potions, mutagens, oils or bombs.
Discover 100 fast travel points.
Destroy 10 monster nests using bombs.
Collect the formulae for 6 different bomb types.
Complete all fistfighting quests in Velen, Skellige and Novigrad.
Defeat Olaf, the Skellige champion of unarmed combat.
Complete the contract on Therazane.
Complete the contract on Sarasti.
Find and free Dandelion.
Slide downhill uninterrupted for at least 10 seconds.
Resolve the doppler problem in Novigrad.
Kill 50 opponents using the environment (e.g. swamp gas, insects or objects).
Kill 5 foes in a fight without taking damage (except for Toxicity) and without using the Quen Sign.
Find the baron's wife and daughter.
Read 30 books, journals or other documents.
Defeat an opponent in a fistfight without taking any damage.
Complete the contract on the shrieker.
Complete the subplot involving Keira Metz.
Kill 3 opponents in one fight using 3 different methods (swords, bombs, crossbow, Signs, etc.).
Learn 12 potion formulae.
Kill at least 5 opponents in under 10 seconds.
Find Yennefer of Vengerberg.
Play three hero cards in one round of gwent and win the match.
Be under the influence of seven potions or decoctions at the same time.
Acquire all gwent cards available in the base version of the game.
Acquire all the Abilities in one tree.
Win all the horse races in the game.
Bring all possible allies to Kaer Morhen for the battle against the Hunt.
Win a round of gwent using only neutral cards.
Defeat Tybalt and win the gwent tournament held at the Passiflora.
Kill a frozen opponent with a crossbow bolt.
Kill 10 opponents by knocking them off somewhere high with the Aard Sign.
Collect all the cards in the Skellige deck.
Collect all available Ofieri armor and horse gear, and at least one Ofieri sword.
Perform 10 effective counterattacks in a row without getting hit or parrying.
Win a round of gwent with a total strength of at least 187.
Kill 50 human and nonhuman opponents by striking them in the head with a crossbow bolt.
Make an opponent suffer from bleeding, poisoning and burning simultaneously. Do this 10 times.
Destroy all monster nests in the Velen / Novigrad region, or in Skellige.
Have all possible Place of Power bonuses active at the same time.
Finish the game on the "Blood and Broken Bones!" or "Death March!" difficulty levels.
Kill 3 opponents with their own arrows.
Buy all the items put on the block at the Borsodis' Auction House.
Ignite the gas produced by a Dragon's Dream bomb using a burning opponent. Do this 10 times.
Use the Axii Sign to force one opponent to kill another. Do this 20 times.
Finish the game on the "Death March!" difficulty level.
Attack, counter, cast a Sign and throw a bomb (in any order) in under 4 seconds.
Provoke all Iris von Everec's Nightmares into fighting you at the same time and defeat them.
Complete the contract on the Woodland Spirit.