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