Maybe you've already solved these but I'll throw in my answers anyway.
VegettoEX wrote:"Perform a Super Attack after sending your opponent flying"
I've sent my opponent flying with a string of melee attacks, a charged melee attack, etc... then flick the right analog stick to do an attack... multiple times... and never get this star. What?!
This might be where you do a smash attack rather than a rush attack. It's probably something like hit X X X hold-up-Y to send them flying back and then smack 'em with a super while they're sailing. I haven't done this one specifically.
EDIT: Okay, I successfully did this. I know for sure that it doesn't work if your opponent already hits the ground (failed with Kuririn's ki spread ball that plowed into Dodoria after he landed). When I got this it was either from doing the above and hitting with a masenko while he was still mid-air or while I was doing a pursuit attack and let loose a masenko after the last hit while Dodoria was still line-driving away.
VegettoEX wrote:
"Make a signature skill the first attack"
By "signature skill" it means the "Circle" (or I guess "B" on 360) button, right? So... I did that. I spammed pressing "Circle" when the match began and made sure it hit the opponent first thing. And I don't get the star. Stumped, here.
Make sure B is the first thing that hits. A little thing will come up that says first attack once it does (assuming you strike them first... which you need to).
VegettoEX wrote:
"Perform 10 Sways"
So I sat there and spammed a bazillion sways over and over, and never got the star. Do I have to actively be swaying around the opponent's attack? 'Cuz I tried that, too (mostly on easy, which is actually DIFFICULT since the opponents rarely attack you...)
I had to put it on normal since the computer usually only uses a ki blast when you fly up to them on easy. Yes, you need to sway around the opponent's attack.
VegettoEX wrote:
"Draw your opponent closer three times"
What does this even mean?!
Confirming that this is referring to Piccolo's signature attack (B).
But anyway, my question...
Personally, I'm having a lot of trouble with the one where it says you need to complete every perfect action. I've accidentally done a few perfect actions before but I'm not sure how. It might have something to do with the directions that appear on the top of the screen but I'm not entirely sure. Specifically this is referring to the last Saiyan battle. I successfully completed the cutscene where you spirit bomb/genki dama Vegeta but still no dice.
EDIT: Successfully did this myself. Top the screen in a rectangle it'll occasionally give suggestions on moves to do. I did what I was told the single time it came up in easy mode and got the star.
