Sorry, I was too overwhelmed with one time success (going from 2/5 to 3/5 completions) that I forgot, it wasn't only 1 game. I tried to come to 4/5 by my instructions and it took 2, and in other case 3 completed games in a row, before I decided to quit to main menu.
In this way I eventually finished the SA challenges. They were my last challenges to get the skin.
P.s.: playing on PC, Europe, GeForce 1050.
I was stuck on this for quite a few games, but then went and played SA just because I actually like playing it, played another 10 games or so, and when I came back to the home screen the challenge was completed and appearance was rewarded. I only left the game once during that stuck time, and leaving and coming back didn't seem to have an effect. But playing a whackload of SA games seemed to reward it in there somewhere.
