Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
So for the 15 wins i did it and published it. I waited 48 hours and it was rejected, altought i did screenshot in fullscreen and it clearly shows my 15 wins (now 16)