I've killed numerous vehicles in all modes and maps, called in support in all modes and maps, yet I still have not completed those two achievements no matter how much I try. Something isn't triggering somewhere.
In addition, I got the "It's All In the Reflexes" achievement by throwing a frag at an AI. The AI picked it up and it blew in their hands, triggering the achievement. Might not be worth fixing, but it was definitely a "huh" moment.