This is most likely the first achievement you'll unlock in the game. On mission 1 'Induction you'll exit your pod, kill 3 or so enemies, descend the tower, exit and finally meet up with an army outpost.
After some dialogue you'll go through a passage of rubble and need to kill some soldiers. After that you'll see two tanks on the path being attacked by a swarm of drones clumped together.
Simply grab a car door for protection, run to the further tank and sit in the gunner's seat.
Aim at the Swarm with
, shoot them with
and when prompted use
to EMP blast them.
Assuming you didn't let the other tank get hit much the achievement's yours!
Here's a vid I made if you need help!