It would be great if I could actually target objects, such as a huge wheel barrel full of explosives. But I have to try to shoot at an enemy on the other side of it for it to trigger... and that little glitch has made me kill myself and redo a mission i basically destroyed... annoying. Otherwise good game. I also had some masters not trigger from the quest as others stated.
TIP: Since the star points can be reset any time you want, put them all to extra coins for the first match. Then repeat the battle as many times as you wish with them allocated to xp. If you rematch enough times, you probably won't need to up their battle stats.
 "Viking Valor"){kind=icon}
 "MINE reloaded"){kind=icon}
 "Loot Hero"){kind=icon}
 "9"){kind=icon}
 "Learn to Fly Idle"){kind=icon}
 "Auto-Attack!"){kind=icon}
 "Snail Bob 7: Fantasy Story"){kind=icon}
 "Several Journeys of Reemus Chapter 4 Beastly Blackhole of Bureaucracy"){kind=icon}
 "Dangerous adventure"){kind=icon}
 "Sands of the Coliseum"){kind=icon}
 "Decision:Medieval"){kind=icon}
 "Mighty Knight"){kind=icon}
 "Lab of the Dead"){kind=icon}
 "Soviet Rocket Giraffe Go Go Go!"){kind=icon}
 "Mike Shadow: I paid for it!"){kind=icon}
 "Dillo Hills 2"){kind=icon}
 "Robots are too optimistic!"){kind=icon}
 "Min Hero: Tower of Sages"){kind=icon}
 "My Pet Protector 2"){kind=icon}
I would love a hard badge, too! Hopefully something that's a little more skill-based than just grindy. Like completing XX achievements or something!