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