Make Quitting a Game Only Available On Your Own Turn
Quitting a match should only be allowed at the beginning of your own main phase.
Since achievements and challenges are a thing, some of them are extremely difficult to do because opponents just quit in the middle of a build up or as soon as they realize they are going to lose. Quitting during your own turn would at least allow a person to finish out how their deck will work and complete challenges.
It's extremely annoying when the task is attack with 5 creatures you just brought out this turn, when I set it up bring out at least 5 creatures and waiting to press the attack button, the opponent just quits. I have been trying for at least 15 matches now, where either I don't draw the correct combo or when I do, the opponent just quits.
At least let a person finish out the turn.
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Rezzahan#77802
commented
Restricting when a player can concede is quite the can of worms you do not want to open.
As for players conceding before you can accomplish an achievement, I had quite the success with asking them to stay by using the "I'm on a Quest" text, that you can get with 150 Pioneer games. Use it when you are close to completing the achievement.