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Just play with any three characters in arcade mode, you will get this going for the complete all characters.

Just click on each Art Gallery, Battle Theater, Exhibition Theater and Character Profiles in the Musuem menu.

Really easy, just pick a character like Siegfried and use his right & Y move. Why this move? Well with 3 hits you get a ring out if your lucky, and there is an achievement for getting all ring outs in Time Attack Mode.

Get an opponent down to hardly any health then just sit back and let them hit you till you only have a bit of health left so about one hit can kill you, then kick their arse.

This is a pain in the ass as just one hit and your dead. The best characters to use for this are either Siegfried or Ivy.
As Siegfreid as soon as you start either press Right and Y attack a few times in a row or walk backwards and wait for them to run at you then press Y 3 times.
As Ivy press Right and hold down Y and hes sword will extend normally hitting the enemy, if you miss do it again quickly.

Unpredictable characters to watch our for are....
Cervantes: He may charge you straight away
Voldo: May start circling around you
Ivy: Same as above
Inferno: You never know whats gonna happen
Edge Master: Same as Inferno

Just finish arcade mode with all 19 characters, Set the rounds to one roundto make it quicker.

Goto practice in the options for freestyle put it to Guard Impact, Attack your opponent and when they attack you press left and A, do this 25 times in a row for the achievement. Your best fighting with Cervantes against Sophitia as she doesn't push you so far away and he has a mid-range attack. The numbers will go up as you do them and they have to be near enough nonstop for 25 turns.

Sounds hard doesn't it, well its not its really simple goto the options and put it on 1 round,Then life and time on infinity. Just get ring outs to win, just use Siegfried or Nightmare and the Right & Y move.

Just get ring outs to win, just use Siegfried or Nightmare and the Right & Y move, Sounds easier than it is as if you mess up just once and kill someone you have to restart. If your enemy only needs one more hit to be dead let them win one round,if your going to lose dont worry you have continues you can use its better than restarting the whole thing from the beginning.

Goto the command menu and it will give you some crazy combo to do on the joypad followed by X & Y. Well bollocks to that just get close the the enemy and from down right on the analogue complete a full clockwise circle and press X & Y at the end, a lot less messing about.

If you can't get it the above way heres an alternate way of doing it......
If you're having a hard time doing the move you can use a vs. match with a 2nd controller and approach your enemy and do 2 or 3 full clockwise circles before pushing the X and Y buttons. You can also go into the control screen and set one of your buttons to 'A+B,' which will allow you to hit only that button instead of both X and Y.

This method only works if you've got a 2nd controller plugged in since you'll never get a couple circles in with an opponent who's actually fighting back, but I thought I'd put it out there if anyone can't pull the move off the other way.

Just finish Arcade mode with any character.

Just win a round taking no damage at all, its not to hard on medium if you struggle just knock the difficutly down.