Hi Vivek,
If I want to see mission requirements then I can get all the mission requirements by checking someone's profile who has completed the hidden mission and accordingly calculate how can I complete my mission
This should also be controlled. If a badge has been earned by anyone, don't let other to see the details if he has not earned it.
Things can be controlled and thus improved. All we need is good initiative !!
All your other points are very good !!
ntn