The reason why I created this solution, is because I did something that a lot of people obviously don't do and I got the achievement around when it should unlock. I got this achievement in my 4th boosting session after boosting around 8 hours 55 minutes. The achievement unlocked after playing something like 200-300 matches. I didn't keep count. Also, I was on winning or losing side around 50/50, so that doesn't matter. My leaderboard score was 74026 after unlocking the achievement.
These 2 things I did every time before and after I booted the game and started boosting:When I saw this message appear:
I always went to Options -> Storage Location
, and I always selected my hard drive, because I think this message means, that everything that you boost during that session, is not saved if you don't go to options and select your hard drive. Leaderboard score is saved, because it saves it to the game servers, not your hard drive.
Second thing I always did was after the boosting session, I went to play the single player campaign and played until it saved a checkpoint. So I suggest you do this too.
So we just boosted it with 6-8 people
on the Den-map
with the lowest score limit
, it saved some time if 2 people go to the animus device from the blue team and starts uploading the animus, the bar fills much faster. Usually one alpha-werewolf drops from the left side of the corridor after dropping down, but not always.
So this is how I got the achievement, it is possible it's still luck based, but please try this method and let me know, did it work. Good luck!