I know its not what you want to hear but...
Unless you absolutely need an internal one, I'd suggest just getting an external drive and be done with it.
The current drive is likely to be OEM, and a suitable replacement (if any) is likely to have to be OEM too ... something which you might struggle to source as a mere home-user.
Other than sourcing OEM parts, I suspect the predominant problem you'll face is having to fiddle around with salvaging the plastic bezel from your old drive and grafting it onto the new one so that it all fits and looks the part on the Acer enclosure.
A possible "quick fix" solution assuming a variant of your Acer model shipped with a Blue-Ray Writer would be to get in touch with Acer and buy one as a spare part.... but as I said, Acer would have had to have been shipping another variant of the same model with a Blu-ray spec for that to work.