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