I received the "Pinnacle of Excellence" achievement for reaching the Gold IV tier.
But I am not so proud about my performance with Ahri in the battle I reached the Gold IV with.
My K/D/A ratio is 3/6/7, and my teamfight participation is only 34.50%.
At least I contributed 40% vision control for my team by placing 12 wards.
And I received the "Visionary" badge for this.
By reaching Gold IV, I unlocked Lulu (champion) and Glorious Lulu (Skin). This is like a Christmas gift from the game.
By the way, Ahri is currently my most played champion. I played 81 matches with her so far, and my win rate is currently 61.70%.