Skullgirls 2nd Encore

Play in training mode for 2 hours. (probably needs to be in one session)

Parry 100 attacks as Big Band.

To parry high attacks press → as it hits you
To parry low attacks do the same but press ↓ instead

Use Robo Fortune's Systemic Circuit Breaker 50 times. Must hit the opponent to count.

Input: ↓↙←LP+MP (requires dramatic tension level 3 or higher)

This achievement requires you to land a combo EXACTLY 829 hits long. No more, no less.
This probably sounds really intimidating (i don't blame you, fighting game combos are insane) but there's an easy way to do this.
Rather interestingly, you don't actually have to be the one doing the combo, The other player can get 829 hits and the achievement will unlock for you as well.
ON TOP OF THAT, this is also one of the few achievements that can be done in training mode, which makes things even more easier!

So start up training mode and make sure your settings are set to these:
Slow Motion: Off
Meter Level: Max
Meter Setting: Hold
Death Allowed: No
Select Button: Dummy Record/Playback
Playback Mode: Repeat
Playback Side Correction: On (you likely won't need this but it doesn't hurt to be sure)
Dummy Action: Manual
CPU: Off
Skip Superflashes: Depends (turning off will make recording a bit easier, but turning on will get you to 829 faster. Pick whatever you want)
Other settings can stay default

NOW FOR THE ACTUAL THINGS THAT YOU NEED TO DO, SORRY FOR KEEPING YOU WAITING SO LONG
Step 1: Pick Squigly as the P2 character. Your own character probably doesn't matter, but I also picked Squigly so you may want to do that
Step 2: Since dummy action is set to manual, you can control the second character with a second controller (if you don't have one, you can setup keyboard controls for P2 in the controller settings). Push your character into a corner and make sure they're both up close.
Step 3: Record this easy little combo (press select button twice on P1 controller to start recording): LK > ↓↙←LK+MK (friendly reminder that these controls are flipped if the character is facing left)
You want to stop the recording (press select button) just as the super ends so there will be no delay between loops. Try to stop at around the 6th hit
If you screw up, hold the select button to delete the recording and try again
Step 4: Finally just play back the recording and wait. If it keeps going past 15 hits or so you did the recording right, and now you just need to wait for the 829th hit.
Step 5: By the time you reach 829 hits your burst meter should be full. As soon as the 829th hit happens press any attack button on your controller to burst out of the combo. If you timed it correctly, great, you got the achievement! If not, get everyone back into position and try again