Earnable Emotes

The new emotes system is very cool, however I think there is room for a lot new earnable content that can be employed with the system. As of now, the only way you can get an emote is through purchasing it with RP, which feels a little lame for those of us that don't particularly like to spend loads of money on the currency.

What if in addition to the emotes that can be purchased through RP there are also emotes that can be earned through in game achievements. Similar to the champion mastery system but with a different set of requirements. For example: Pentakill emotes, they have a small bit of the champion you earn a pentakill with and a x5 underneath the picture. X Victory emotes, awarded for earning x amount of wins with a champion. These emotes would only be usable with the champion unlocked, and what give players an objective to work towards similar to champion mastery or after the champion is already level 7 and you still want to be working towards something.

Thoughts?