hey Enrico. i want to confirm after the service is done,I go to PC first. One of the chef mood is still orange. Then i go to the door to cook new dish and they changed to green. does that count?

After more than 20 hours of research I found a recording of a game session from a user that got that trophy, and found out that the "Yes, chef" that's highlighted by the yellow background in the menu where we set what other chefs cook during service... is not yellow, but gold, and that's what brings the chef's mood back to green, even if they clock in, in the afternoon, with an orange mood.
Using a menu with just 1 vegetarian plate (choose the Stuffed Zucchini), 1 meat (Beuf Burguignon) and 1 fish (mussels with potatoes), I asked the chefs to make 3 of their own dishes and just 1 quantity of the dish linked to the chef that's either missing from service (like if they asked the day off) or cleaning the dishes. With the accessibility options active and a dining room set at the minimum you should only need 5 to 7 dishes tops to call it a day and close service.
Again, after 4 days of this, the trophy popped.

Thank you!!! VERY HELPFUL!!

Your guide is so helpful . Thank you

I finally got the achievement thanks to this guide. Thank you so much.

I guess it's important to avoid making orange mood due to my own decision. As explained in step 3 random orange mood doesn't matter. But when I assigned cleaning to another chef who seemed fine with cleaning, they sometimes got suddenly frustrated and I couldn't got the achievement. During 10 days my chefs got random orange mood for 3~4 times, but I still got the achievement. So it's totally ok to let the orange mood chef clean and just sit in the chair, as long as you assign the orange mood chef cooking during the service.

I am currently struggling to snag this achievement 75 days into my current restaurant. I will try out these instructions, but I have been dealing with frequent days of all 3 chefs not wanting to clean.

Even when I try to follow this guide, the game still flips me off.

I follow step 3, and ignore if a chef is upset from cleaning and keep them sweeping the store before service, and have them cook nothing but their specialty. I even tried to switch the menu around and have that chef cook 2 specialty dishes - and when that didn't work, have the other chef cook 2 specialty dishes. Almost everytime, that chef still has a orange moodlet at the end of the game.

Like this entire achevement is just a mix of bad rng, bugs, and poorly explained mechanics. I wish at the very least it wasn't 10 days because that's way too much time given how long services are even when you trim most customers off + exclusively use the side chefs

Nice to meet you. I found this guide in a thread on the Community Hub and read it.

At the end of point 5 of this guide, it says, "Sometimes all three chefs will dislike washing the dishes. Bad luck, but it will happen really rarely." I have also confirmed this. The problem is that even if this is rare, there is no way to avoid it. In other words, if it happens on the 9th day, everything will be for naught. In that sense, this game has a big problem.