>>527401575
>eternal
Achievement milestone tracker you can only get with RP. There's two sets, Series A and Series B.

>champion permanent
Full BE value of a champion or a free full unlock of a champion.

>champion shard
Half, or even a quarter of the value of what the champions' worth (if you disenchant it) - have to pay to unlock it.
Whatever.
I don't know how to explain it very well. You're right. All of this should be in the game somewhere along with a glossary of terms and a whole tutorial section of the client explaining concepts.