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