Maybe adding separate is a good idea, Because you might have a Barb King level 26 and an archer queen level 12 so..
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While I love the idea of adding more achievements, I'm not so sure this is a good one.
Incentivising people to take out heroes may prove to be quite the annoyance for those who don't leave heroes sleeping all the time. Right now, most people won't go out of their way to kill them (town hall snipers for example). If this were added, they might.
This is a great idea it wouldn't do any damage to the game, I love the idea their isn't any achievements for hero's now so this would do that. Its not an unreasonable thing to ask in my opinion. They're is a reason they are hero's it should be hard to kill them and this would reward people who did that.