The achievement is located in The Final Test tutorial mission.
At the beginning go to the right side and climb inside the base. Go forward and climb over the second fence and go through the first window into the base, turn right immediately and pick up the wrench in the next room.
Go further forward in the next room (locker room) and pick up the worker disguise on the left side then go to the airplane hangar and sabotage the ejector seat.
Pick up / read the safety protocol and go upstairs to Jasper Knight and talk with him. He will follow you to the airplane to go through the check list.
After some checks the ejection seat gets released and the achievement unlocks.