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