Collect 'Em All

Side quest in. This just might be the most difficult, non-combative quest you’ll ever undertake!

Basics
To complete it, you must collect every single card of each type; a total of 120 cards, from the 199 available cards. The other 79 cards are duplicates (for example, there are three “Ghoul” cards you can find, but you only need one for this quest objective).
 * Northern Realms Gwent deck (40 cards)
 * Nilfgaardian Empire Gwent deck (41 cards)
 * Monsters Gwent deck (44 cards)
 * Scoia'tael Gwent deck (41 cards)
 * Neutral Gwent cards (29 cards)

Journal entry

 * In his previous adventures, Geralt had gained fame as a master dice poker player. Yet having mastered all challengers in this arena, he had no choice but to find another in which to garner more laurels. He thus decided to take up gwent, and since he aimed to play at the highest levels, he felt he had to gather a complete collection of all the cards available – including some which could only be had by winning them off the best players around.

Walkthrough

 * Complete your collection of Gwent cards.