Here is the full list of all 78 The Witcher 3: Wild Hunt - there are Complete Edition achievements worth 2,000 gamerscore.
Obtain a flawless victory in all the competitions during the knights' tourney.
Help unite the warring vineyards and have a wine named in your honor.
Travel to the Duchy of Toussaint.
Destroy all monster nests in the Velen / Novigrad region, or in Skellige.
Finish the "Hearts of Stone" expansion.
Participate in all the activities at the wedding.
Kill the prince cursed into a toad.
Reach character development level 35.
Perform 10 effective counterattacks in a row without getting hit or parrying.
Complete all witcher contracts.
Complete all fistfighting quests in Velen, Skellige and Novigrad.
Defeat Olaf, the Skellige champion of unarmed combat.
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.
Bring all possible allies to Kaer Morhen for the battle against the Hunt.
Complete the contract on Morvudd.
Slide downhill uninterrupted for at least 10 seconds.
Complete the subplot about choosing Skellige's ruler.
Complete the contract on Therazane.
Kill 3 opponents in one fight using 3 different methods (swords, bombs, crossbow, Signs, etc.).
Help Yennefer extract information from Skjall's body.
Discover 100 fast travel points.
Complete the contract on Sarasti.
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.
Destroy 10 monster nests using bombs.
Find and free Dandelion.
Collect the formulae for 6 different bomb types.
Resolve the doppler problem in Novigrad.
Defeat an opponent in a fistfight without taking any damage.
Kill 2 monsters you have a contract on without using Signs, potions, mutagens, oils or bombs.
Complete the subplot involving Keira Metz.
Read 30 books, journals or other documents.
Complete the contract on the shrieker.
Find the baron's wife and daughter.
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.
Find and equip all the elements of one set of witcher gear.
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.
Recreate all of Iris' nightmares in the Painted World.
Kill Golyat with a crossbow bolt to his eye.
Acquire all the Abilities in one tree.
Unlock the bonus for equipping all the witcher gear elements from one School.
Be given Aerondight by the Lady of the Lake.
Win all the horse races in the game.
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.
Win a round of gwent with a total strength of at least 187.
Serve time in Toussaint.
Be decorated with the Order of Vitis Vinifera.
Kill 50 human and nonhuman opponents by striking them in the head with a crossbow bolt.
Kill 20 cows.
Make an opponent suffer from bleeding, poisoning and burning simultaneously. Do this 10 times.
Finish the game on any difficulty.
Use all available options for developing Corvo Bianco.
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.
Defeat Eredin.
Find all grandmaster diagrams for each witcher school.
Finish the game on the "Death March!" difficulty level.
Develop a mutation.
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.
Defeat all the fallen knights and loot their campsites.
Complete the contract on the Woodland Spirit.