Don't know the nuts and bolts of how this stuff works, but I guess it's probably something you'd need to work with EGS to implement?
Ding ding ding - and therein lies the problem. It'd need to be coded in, implemented, and tested. And right now EGS is beginning their final sprint on what is probably their biggest, most important, most impressive project
ever. As much as I like seeing our fans get Cool Stuff, EGS is in charge of the code for Recettear and I'm not going to burden them with this while they're so hard at work.
Definitely not ruling out the possibility of achievements, at least, sometime next
year, possibly as part of a wider promotion - but this year, it simply isn't happening. EGS needs as few distractions as possible.