I have a suggestion for a Gwent achievement/in-game contract. Most often people keep playing the same deck across multiple matches, grinding it to insanity, not even switching between factions, however, to get a good ranking, you need to advance 4 factions, be flexible and well-versed overall.
The contract suggestion is: Strike 3 wins in a row using decks from 3 different factions (could be extended to 4 victories in a row with 4 factions, 5 with 5, 6 with 6), with keys as rewards (and maybe a trinket).
It takes skill to strike a couple of wins in a row, but a series of victories with a different faction every game is even more challenging
The contract suggestion is: Strike 3 wins in a row using decks from 3 different factions (could be extended to 4 victories in a row with 4 factions, 5 with 5, 6 with 6), with keys as rewards (and maybe a trinket).
It takes skill to strike a couple of wins in a row, but a series of victories with a different faction every game is even more challenging