The Hearts of Stone Add-on for The Witcher 3: Wild Hunt has 13 achievements.
Win a round of gwent with a total strength of at least 187.
Slide downhill uninterrupted for at least 10 seconds.
Kill 20 cows.
Be under the influence of seven potions or decoctions at the same time.
Kill 3 opponents with their own arrows.
Kill the prince cursed into a toad.
Participate in all the activities at the wedding.
Buy all the items put on the block at the Borsodis' Auction House.
Recreate all of Iris' nightmares in the Painted World.
Finish the "Hearts of Stone" expansion.
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.
Collect all available Ofieri armor and horse gear, and at least one Ofieri sword.