but shredding cards for an achivment could be possible.
For example:
Shredd 10/50/100/1000 common cards to get sth. (dont know, maybe a Mini Booster or even a General one?)
Shredd 10/50/100/1000 uncommon cards to get sth..
Shredd 10/50/100/1000 rare cards....
Shredd 10/50/100/1000 ultra rare cards...
Just numbers that came to my mind.
So this would delete a lot of cards and bfp to get less bfp, gold or what else. Kinda just to "reroll" bad or unwanted card for a little chance to get some good out of it.