I do not think the requirements to become mentor are unreasonable.
I have been playing ffxiv for a very long time. I am very proud of my Cait Sith minion.
I have four alts. Three alts are ilvl 320 and above (lvl 70, yes). Fourth alt is at lvl 61(NIN).
Between the alt's I have met all the DPS/Heals Achievement set requirements.
Am I complaining? No, not at all. Trolling? No, trolling is for people who have nothing better to do then to create/cultivate conflict. Suggesting then...? Most definitely.
My suggestion, then. is this: Please consider the possibility of binding some achievements to account level, such as class/jobs completed, commendations and dungeons completed instead of binding them to a particular character.

Thank you for your time.