Just thought I'd post some clarification on a bug fix. The 'Rat Race' achievement is now fully working and has been completely tested. In order to earn it you must bet on a single rat of your choice and no others until you net 10 wins in total. If your chosen rat is not in a race, then you may not participate until it shows up again.

Betting on your chosen rat and losing will not reset your progress, however betting on any other rat will. I hope this is easy to understand, the achievement was bugged and was resetting if your chosen rat lost a race.