• 0:35 - Terminal 2 - Mission 3 'Forerunner' - Rally Point Bravo
During the mission, near the beginning, you will defeat a small group of crawlers and a promethean knight outside in an open area, and your HUD will begin to become distorted. Masterchief and Cortana will begin speaking about the signal distortion, and masterchief will say "What's with this distortion?". Once this happens, the terminal should be on ground level, under the next objective.
• 1:28 - Terminal 4 - Mission 5 'Reclaimer' - Rally Point Bravo
Midway through the level, after the first main cutscene, you will end up indoors. You will have to pick up Cortana and make your way through a hallway. Instead of boarding the elevator (primary on-screen objective) take a right and the terminal should be there.
• 1:55 - Terminal 5 - Mission 6 'Shutdown' - Rally Point Delta
When progressing through this mission, you will come to a section with a bunch of light bridges. At one point you will reach the end of the path and two hunters will appear. The terminal is directly before this checkpoint, but you can easily backtrack. When going from the entrance to the location of the hunters, take the last possible left and the terminal will be located behind the structure on this platform.
• 2:21 - Terminal 6 - Mission 7 'Composer' - Rally Point Bravo
Once you reach the outdoor part of this level, run across the terrain to the building that says "Atrium" on the side. At the base of that sign is the Terminal. The "Atrium" sign does repeat itself on the side of the building, but this is one the closest and in the most clear sight from where you begin this section.
• 2:59 - Terminal 7 - Mission 8 'Midnight' - Rally Point Bravo
Once you get to the part of the level where you are in foot, progress through the story by clearing the rooms of enemies and moving forward. Once you enter the 3rd or 4th room, you should see the terminal located behind two pillars. Walk around to the back side to access it.
Well, I promise I'm not saying this in a bragging way, I maxed anniversary in 2 and a half days, but the skulls/terminals were generally in predicatable places, I'm honestly scared stiff about this though, at least with anni, I could go back to halo 1 and search for plausible places they would hide them, this is unforeseen... still should be alot of fun though :D
*You can do this on any difficulty *Requires waypoint to watch the terminals
Terminal 1: Near the end of the mission, after defeating two Hunters (the large armored enemies), you'll gain access to the tower. At the end of a long hall you'll see a wide, semi-transparent ramp. Check underneath this ramp to find a terminal.
Terminal 2: Soon after taking out a group of Prometheans (just a few minutes into the mission, depending on difficulty), you'll notice a large structure with rocky slopes on either side leading up to an entrance. At the very moment where Master Chief asks Cortana, "What's that distortion?" in regard to his HUD, you should be facing the terminal, which is at ground level.
Terminal 3: Immediately after the cutscene in which you meet up with a group of friendli
Terminal 3: Immediately after the cutscene in which you meet up with a group of friendlies, simply turn around.
Terminal 4: Exit the room in which you reclaim Cortana to find an elevator directly in front of you. Instead of immediately boarding it, look down the hall to your right to find a terminal.
Terminal 5: After entering the production tower (third LZ for your Pelican) in an attempt to reach the Spire controls, Cortana will place a waypoint. Instead of turning right and heading for it, continue forward to the structure at the back of the large room. On the far side of said structure, you'll find a terminal. If you've encountered the Hunters, you've gone too far and need to turn back.
Terminal 6: After the cutscene in which Master Chief meets with Dr. Tillson, head outside. You'll see the Atrium in front of you. Head directly for the area below the "Atrium" building printing on the right side to find a terminal between the jagged rocks.
Terminal 7: Once you're on the 'ground,' you'll proceed through a series of rooms. In the third room, behind the central pillar, is a terminal.
ONE TERMINAL IN EACH LEVEL, BESIDES THE FIRST LEVEL: DAWN.
If you look for the walk-through on this site (here) it will show you where all the terminals are and if you read the posts it will tell you how to unlock the Raider Armor plus artwork galleries and an Avatar award..