Not that I can find. But left and right I managed to get some of the information.
Emotes
Defender of the League = 500 hours playtime
Champion of the League = 1500 hours playtime
Ultra-rare Conqueror of the League = 2500 hours playtime
https://i.imgur.com/T6WKnA5.png
Rune Enthusiast Ward Skin
We'll introduce an exclusive ward skin for anyone who owned any special legacy runes OR who spent at least 125,000 IP on runes or rune pages* before the September 1, 2017 cutoff date. We'll also give rare rune owners a special commemorative icon.
*If you bought rune pages using RP, we'll count each of those as 6,300 IP spent toward this reward.
https://i.imgur.com/H0hVREK.png
Mystery Skins & Page Purchaser Icon
Can't find but my mission said the following:
And again, for every 4 pages you bought with RP you get 1 Epic Skin
https://i.imgur.com/3JFS9xM.png
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And the special BE store, limited time:
https://i.imgur.com/idVnZyU.png