Looks like it could be rot, the leaves look soft, but there's not too much browning yet it seems like. Once a week watering could be way too much for succulents, especially if the soil is heavy. I would get it out of the soil let it dry out and also examine the roots, then repot it in something more porous and fingers crossed. Good luck!

Yes, the leaves are soft. :( And the 'wrinkling' of the leaves starts from where its connected to the stalk. I want to repot it, but how about the growing pup (is it a pup? *3rd picture*) below? I'm afraid I'l hurt it. Any tips?

Alright! Thank you! I will repot it. Hope it recovers!

Always do a checklist and correct if all is not in order.
- Is the mix fast draining material (pumice, perlite, gravel)?

- Does the pot have a drainage hole?

- Is it getting sunlight or very least very bright light for more than 5-6 hours?

- Does the area get too high or too low temperatures in the window?

Do you have to move it around every night? Can it stay in the window permanently? It looks like something damaged the center. When you watered the plant did water get in the center of the top of the plant and stay there?

Nope, I always water directly at the soil.

I place it in the windowsill every early morning for about ~3.5-4 hours bec the light gets too intense for the window is east facing. I then place it near the window where it is bright but not glaring.

Temp here aren't extremes. Mainly hot/hot humid. Not damaged by rain since its always indoors. Ventilation is good, i place it near the window.

Check on the drainage hole.

The soil I think is not that bad, but I'll repot it otherwise..bec I can't think of other reasons of what's wrong based on the checklist.

Thank you for this checklist! v helpful! :)

is mentioned window closed all day and all night ?

nope, its always open.

Succulents do best in a south window. Second choice would be west. East third choice, North worst. Echeverias need a LOT of light or they get leggy. I think its a combo of over watering and not enough light. Can you put it outside at all? Youd have to cclimate it to full sun first, but that would be best for it. If not, if you have a south facing window inside, thats your best alternative.

Bang on @LilBit, and that would be why I never got any more Echeveria other than my pulidonis (that one seems to do fine with less light), most of them would stretch like crazy no matter what I do, because my apartment window is north-west facing :(