Question about gaining icons with the bildgewater event?

So..I chose twisted fate...

and it says i need to gain 25000 gold and 50 total assists...now...do i need to gain 50 assists at once or 50 assists altogether?

becuase ive played 2 arams with a support champ and gotten a total of 66 assists and none of them are showing up. Do I have to gain assists on another game mode OTHER then aram? please clarify.