Include Small Rewards with Achievements

Achievements are nice but they can feel hollow. 
It might be more meaningful and more motivating if the badge also included a small prize. 
A minor monetary boost maybe, a random gift or even free brief VIP for bigger achievements 

The areas I see this being very beneficial are login streak and lack of fainting. It would add encouragement for being active. As a rough example:

10 day logins = 50 galleons

100 day logins = rare item

365 day logins = VIP for 1 week