Maybe add a grey box list of what achievements are attainable so that I know what to shoot for? Also maybe a few more upgrades for some of the heroes? It's pretty fun and more animated than most idle games, so I look forward to seeing future updates and the like.
You should consider allowing people to buy better odds for the casino, that way we can complete the quests without pure luck. Another thing is the target range seems impossible to me. Maybe make the targets disappear much less. Whack a mole was at least manageable for the quests, but the targets...
 "Clicker Heroes"){kind=icon}
 "Pingy the Ping Idle RPG"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}