Well actually I have got rank under 500 twice but I didn't got the sensei achievment, and ofcourse I have done the "hitting air" achievment but why I didn't got it? And "head hunter" I have already decaped 25+ ugly heads in a week, I know it cause I count it. And the "Cassius Clay" I really remember that time when I beat a player in 2 turn (aikido) and its ofcourse less than 30 frames. But why I didn't got it? Is there something wrong? Or its normal? thanks

Most of the achievements are currently glitching/not working.

I don't even know if they're going to be fixed

About the Sensei achievment..
A few months ago, I had rank of about 300 and the achievment came a few weeks later.
Same may happen for you.

So it isn't automatically achieved?

sensei is about the rank you see on your achivements card
Yours is 0
and casious is broken

Why mine is 0?

Because of belt maybe and surely, or maybe because yo need to mantain your rank for more time

Just give it time and for your information some are glitched.

Yeah but my user card is empty because of it-_-

Like Ponzo said, just be patient for the mods to fix it.

Solax Moderated Message:

In the future, please don't simply repeat what others have said.