So I won a few competitive matches by now, most of them pretty closely but never got the contender achievement. So I thought it's probably bugged just like with the other firefight and push victory achievements where you'll need to win every single round of the match. So I did just that in Competitive (with help of my team obviously) and still not contender achievement. Check out the replay if you wish but this achievement seems just bugged and that's bugging me since it's one of the last I'm missing. (Replay ID of the perfect 5-nil competitive match: a07b9dbf-c737-4b6b-8bcd-4f0d8c4b2dd9)