How do you get the Season 2 Reward - Silver All?
It was a ranked reward. Riot's description in the client reads: “Earned by achieving Silver in the 2012 ranked season in all queues.”
Is the Season 2 Reward - Silver All still available?
No. The Season 2 Reward - Silver All was a ranked reward: to get it you had to reach Silver during Season 2 (2012). Riot does not give out past ranked rewards again, so it cannot be earned anymore.
