Added all the achievements (Finally!) (Patreon)

I have finally written all the achievements and the conditions to obtain them (+ a check to support old saves).
They are made so that all the achievements can be unlocked by both the protagonist and secondary character and all in a playthrough (although this may be quite hard).

Of course as I add more days, the achievements for those days will also need to be added but the "Base" ones are all in and at this point it is only a matter of adding incremental ones.