So endless survival is a mode where you pick a character and you battle AI's continuesly ,health carries over each round while recovering a small proportion of HP (1%~11%)

First 20-30 stages feel like a walk in the park , AI 's not guarding much and not commiting to full combos. After that though , they rise in stars/difficulty , making a few mistakes here and there fatal.
(lost many times between 35-47)

RNG is a big factor , regarding which char you ll fight against ,when the enemies start rising stars and how good they punish your whiffs/mistakes.

Most people online reccomend cheesing this achievment with Nonon Jakuzure long range attacks, but in my 3 attempts i found it hard after stage 40 and 1 star enemies , cause of her lack of close range attacks and her low HP pool , making 2-3 punishes enough to make you start all over from the beggining.

I used Ragyo and i managed 66 win steak on my 2nd attempt with her.

So , as i mentioned above , till 30 (Except a few occassions) its mostly a grind than actually playing carefully but after that , things change.

- Try to get Bloody Valor to lvl 3 as soon as you can , it stayes lvl 3 till it drops back to lvl 2 again (every 10-20 stages) Get as many insta kills as you can !!
PS. Try to learn a simple combo that can connect/special cancel with Valor Burst (Valor level 3 - 5 bars attack)
For example with Ragyo , simplest route goes □ > □ > Valor burst as you can see in the vid below , but for Matoi Ryuko , that link wont work and her Burst will whiff , you ll have to go □ > □ > □ > Valor Burst. Each character has unique combo routes , try to lab for the character/s of your choise.

- A trick to have better chances of winning a bloody valor fight vs a CPU is to let it hit first a button and then going for HP recovery (worked 75% of the times for me at least)

- No matter what stage you re in , if you encounter Ragyo with the godly hood , you wanna kill her asap (prefferably with V,Burst instakill) since she has the largest HP pool/defence , and her small , full-pledged most of the time , combo can 1/3 your HP for nothing.

- Learn Safe Setups. In my case with Ragyo , safest combo route > setup i found out was
□ > □ > ↑□ > ↑□ > ↑□,,,, ↑□ till hard knockdown , then aerial Burst Attack (ｏ) for the oki.

- If you re in a tight spot , you can just block till you find the needed gap , only thing that cant be blocked is the burst attacks (the ones with a charge up start , which flashes the char with white/red stars) but if you sidedodge those (Block + L/R movement) you can easily punish with a full combo.

- As i mentioned above RNG is a big factor. Dont give up. If it feels like a chore just take a break , it ll come natural to ya after a while.

Thanks for reading this guide and/or watching the video !
I hope i helped the few wanderers who may stumble upon this guide !!
If it did please let me know in the comments section below , and if you need some clarification or want me to add something to the guide , let me know as well.

Cheers and Good luck ~