I have now been informed that any payment to TranslatorsCafé is sufficient to access the Hall of Fame and Shame. From the message I received:
[...] any payment (starting from $10 for credentials verification) [is] enough to get full and unrestricted access to the Hall of Fame and Shame without any time limitation. Active members also have full access irrespective of their membership status. For those who cannot pay, there is always a possibility to ask any moderator to provide with free access.
I will also update the original post with this new information.