While I've been editing today, I noticed that Karts and Bikes have their own categories. However, the achievement regarding Karts editing does not include Bikes. Yes, I realise that sounds pretty obvious, but let me explain myself.
I thought: Wouldn't it be better to simply combine the two categories into a singular "Vehicles" category, from which we can sub-divide into Vehicle:Karts and Vehicle:Bikes? This way, it acknowledges that Karts and Bikes differ from each other, but also acknowledges that they are both types of vehicles.
I thought I'd ask the rest of you guys for your thoughts before I went ahead.