I should have got them but I didn't, has this happened to anyone else? (Assassin = most stealth kills, Boing! = most air stomp kills)
I got one air stomp kill, but no-one else had any (it was a small server and I was sure about that)

bump

I'm missing mystery one although I'm way past lvl 50 so o guess it's a bug .

You need more than 1 airstomp kill to get it even if you're the only one who did it. I usually get it when I do more than 2-3 airstomp kills. I suspect it's the same thing with the assassin dog tag.

You need more than 1 airstomp kill to get it even if you're the only one who did it. I usually get it when I do more than 2-3 airstomp kills. I suspect it's the same thing with the assassin dog tag.
Okay... but with Assassin I had 2 stealth kills

I've got EVERY award including Boing! and Assassin and I can say it's all okay. Just try to get as many SK/ASK as you can.

Would be hard for ASKs lol I'm terrible with Airstomp

I've acquired the Boing! award on my first try (Skyline). And while I was at it, I did an Air Stomp Double kill. In the same match.
I'm lucky. Or pr0.

I think you can only get 3 awards per match, and some are more significant than others - so even if you do get the most stealth kills or Air Stomp kills if you do better things (highest obj. score, highest KDR etc.) I think they will just replace them.

i got the Boing! like...about 100 times or less XD