While ISO 8895 - 1 recognize accented letters like Àà Ää Ââ Ãã, it couldn't recognize this acute accent
and it's converted to this sign:

I did some research and find out this acute accent is without any associated base character below. (For more details please refer to https://www.cl.cam.ac.uk/~mgk25/ucs/apostrophe.html). Not sure if this is the reason why ISO 8895 - 1 doesn't recognize this acute accent, but it doesn't really make sense ISO 8895 - 1 recognize only part of the acute accent.