I'm really not sure what the achievement system does for me, as a player (unless it's to encourage me to try certain/new things). If that's the point then maybe here's something to consider. It's not any sort of performance or war winning accolade (it's actually inspired by my making skin thumbs):
Achievement: Looking Sharp
Players that fly/roll in every skin available in game of every plane and vehicle model get this 'achievement.'
Achievements don't earn perks, do they?