Trending @Accenture; What are the consequences of not going once a week to office ? Can we skip once a week in a month only for one week?

Bull shit, it'll depends on your manager and their rapo with their leads. My friends in certain projects are doing permanent wfh and i'm doing wfh from the past 2 months.
Note: When we're in office we work from client site not from the Accenture buildings

Consequences are serious including possible termination

Nothing severe, and depends how you handle your PL, put a SL on the day of office, if you're worried