Halo: The Master Chief Collection - Halo 2 - E E E - Halo 2: View both signs in the level Metropolis. This achievement is fairly easy to unlock.
On the mission Metropolis, near the end of the mission where you meet the two wraiths. Turn left on the street and drive till you see and sign that is flickering between two messages.
Hop out and look at it and your achievement should pop! Enjoy!