Terminal 1 (Requiem) - Towards the end of the mission "Requiem" (after taking down the two hunters and getting access to the tower) you'll see a large ramp. The terminal is located underneath the ramp.
Terminal 2 (Forerunner) - Near the beginning of the mission "Forerunner", when the Chief asks Cortana "What's that distortion?" you'll see a large structure embedded within the the rocky…
Atlas is an action-rpg with rogue-like elements where you use your ability to control the ground to fight the enemies and move through procedurally generated worlds.
