How do you earn the car exploding achievements?

[Intrepid Stupid]

I figured there be a battle in there but I finished the bonus mission and nothing!

[Paragon]

You can get the achievements during the mission where you inflitrate the police station.

After you foil the mage ambush and reach the command centre, there's a jackpoint in the room where you can enter the Matrix. Make sure you bring Is0bel or a good decker because you have to be fast; you only have five combat turns to evacuate the command centre before anyone inside gets trapped.

There's a program located behind a blocker IC that you need to collect in the Matrix if you want to blow up the vehicles in the motorpool later on. After you collect the program and killed all the police officers, you need to follow Qiu's suggestion and go down to the motorpool. Once you're down there, follow the wall along to the east of the map and there will be a panel you can hack. You need someone with a good decking or drone control skill to hack the panel so either Racter or Is0bel will do.

After you hack it, you will have the ability to blow up vehicles. Just select a vehicle with an icon over them and they will blow up, severely injuring anyone who's too close. That will give the first achievement.

To get the second achievement, you need to blow up all the vehicles in the motorpool, every single one. Just make sure you do it before you kill the last squad of police at the southmost corner of the map. Otherwise, you can't blow up vehicles anymore and you'll lose out on the achievement.