My 'Street Brawler' achievement isn't working

So recently I found that although my ‘Street Brawler’ achievement is colored as other completed achievement in game and has been shown achieved on steam since 2018.8.26, it still has the progress stuck at 1 of 2 in game and is not achieved in the official achievement website( Gaijin Achievements.
By then I try to make the achievement completed in game, but it seems not to be available, I think I reached the condition, destroying 2 enemy tanks in the 10m range of my tank within 30 sec, for at least two times, but the progress remains at 1/2.
I’d like to know is this a bug or is my understanding of the achievement’s condition inaccurate?
If it’s the former one, can it be fixed? If the later one, can someone clarify the condition for me?
Relevant files are shown below



So I played a few more missions, the achievement in game is completed at some point.
Though quite confused, I think my problem is solved:)