This achievement is not as hard as you might think. The key here is practice, especially for the bosses. You can practice every enemies in every variant and all bosses in the hub area.
Obviously its much easier to do this when you have all skills unlocked, especially some of the focus attacks are quite useful.
Also don‘t forget to use these focus attacks! Use them on enemies you either struggle with or that are hard to fight anyway and bosses of course.
My fighting style was always the same for all bosses: dodge/parry their attack until they are open for a hit -> hit him once and do a throw -> use the Y chasing attack to knock him on the ground and do a ground attack -> repeat. Throwing them into a wall is even better if available, because it does more structure damage.
I would try to do all of the first 4 levels without dying once, since the endboss can potentially ruin your day if you have to beat him without dying.
There is an optimal route for every level to get the most shrines while having to fight as few enemies as possible.
You can choose the upgrades as you like but i went for life regain after takedown first, then structure damage with parries, then increased weapon damage and last i did structure reserve.
I have a youtube playlist with every level beaten without dying and using these exact routes:
https://youtube.com/playlist?list=PLM0zKjx-cD6dgP3FZzDfvElHL...For those who prefer a short description:
The Squats: i went the long route through the entire level since it offers 3 shrines and the enemies are rather basic still, but you can still get 2 shrines by using the big shortcut in the beginning by using a key to unlock the door on the ground floor in the first building.
The club: go right after the dancefloor and immediately right again. Dont forget the shrine in the gym area. You dont have to fight those too. Just say „im ready“ to the guy talking to you and he will let you pass.
The museum: go straight to the staircases to the second floor, through the exhibition (1 shrine in pendulum room), on 3rd floor go through the door to the miniboss to skip a very hard exhibition, go to 4th floor and left to the 2nd shrine, turn back and use the elevator to skip to the boss and the 3rd shrine.
The tower: use the elevator skip to the cave area. The shrine in the office is way too deep into the level to be worth getting.
The sanctuary: after first enemy go left in the kitchen to the 1st shrine, follow the level normally to get a 2nd shrine and a broom for the last open area with a bunch of enemies.
Thats it for me, i hope it is a little help/guidance. As for the whole game its basically just a matter of patience and practice. Good luck!