gamesmaster285

Best answer as chosen by Asker / Ratings
You just need to find and activate all 7 terminals in the game. Look at the walkthroughs if ypu don't know how.

xc77

No you do not have to beat the game only access all the terminals.

You must wait until the screen turns red and switches to another message, or it won’t count towards the achievement.This is were all the terminal location

Mission 6: The Ark
TERMINAL 1: Beyond the camp where the Hunters are fought, in the facility at the end of the tunnel. After stepping through the first door, turn left and go through the door there. Keep an eye on your right, the terminal is along that wall. TERMINAL 2: In the large room, beyond the door that Guilty Spark opens. Approach the mechanism here and hold RB to extend the bridge, allowing your allies to cross. After activating the bridge, turn around and move towards the terminal.

TERMINAL 3: After fighting the Scarab, beyond the room with the sleeping Grunts. Go down the ramp leading to the lower level, at the very bottom, turn around and move towards the wall. Turn to your right, until you see a door. Step inside, approach the terminal.

Mission 7: The Covenant
TERMINAL 4: In the first tower. While facing the elevator controls, turn left and jump over to the walkway. The terminal is along the wall there. Approach the terminal.

TERMINAL 5: On the second tower, head up the ramp and make your way to the entrance. While facing the entrance, turn around. The terminal is on this wall. Approach the terminal.

TERMINAL 6: In the final tower. While facing the elevator controls, turn right and jump over to the walkway. The terminal is along the wall there. Approach the terminal. Mission 9: Halo
TERMINAL 7: From the starting point, walk down the trail until you see the strange structure up above near the end of the path, turn right just before the drop and climb up the hill. Get onto the walkway, travel to the end, then turn left. The terminal is on the wall there. Approach the terminal.