The 50 achievement idea would actually be pretty legit, in my opinion.
I've played for well over a year now, multiple accounts, and I've noticed a lot of new players that come to the server and within 3 or 4 days, they are gambling. They can end up making a little bit of a bank from a couple of days of grinding, but then they complain once they gamble and lose literally everything they've worked towards earning.
The 50 achievement idea would not only deter new players from gambling their goods straight away, and also stack up with more goodies, by the time they reach this mark, to gamble with IF they decide to after the 50 achievement mark.
I like this idea, Logical.
