Was just playing some arena and had the Hotter Streak achievement on track. And when I left be4 scoreboard came up on one game we lost i noticed my Hotter streak achievement still said "4/10" so I started to keep leaving every game we lost be4 the scoreboard came up and after a few games I had earned the achivement. Even tho we just played 10-6.
I knew it was a bug just like this in early start of the season when u could leave without losing any personal rating but they fixed it. But this they have probably missed out.