I am not pretending to be objective about this one, but for me achievement systems in games were always associated with developer's inability to attract player's interest to the game without any artificial and redundant goals which achievements are. Our gamemode is interesting and funny without any ranks and titles - that's my opinion. So,
-1.
As long as it is fair and unbiased, why not.
That would never be neither fair nor unbiased. People who are capable of making it fair and unbiased won't bother spending their time on such things. As for others, they would use this to assert themselves at the expense of people they don't like.