Halo: Combat Evolved Anniversary

TERMINAL LOCATIONS:

Pillar of Autumn:
At the beginning of the level make you're way to the bridge. After talking to Keyes and regaining control of the chief, find the glowing red computer console to find the terminal.

Halo
After entering the underground tunnel, proceed like normal, but instead of jumping the gap like normal, find a small side tunnel in the immediate area and you'll find the terminal at the end of it.

Truth and Reconciliation:
After defeating the Zealot on the Bridge, use the red console on the raised platform in the center.

Silent Cartographer
When heading for the Security Building, you'll encounter two hunters in the center of the island. The terminal will be located on the wall of the structure in the center of this area.

Assault on the Control Room:
Toward the end of the level you will come to the Pyramid with the Control Room at the top. You'll notice a long, flat piece of the structure running straight down the middle of it and going into a crevice in the ground below. Go inside this crevice and you'll find a terminal mixed in with a large amount of hidden ammo supplies.

343 Guilty Spark:
After making your way to the Elevator that will allow you to escape the underground facility, you'll find the Terminal above the doorway you came out of. It can be reached by activating the Elevator, than timing it correctly and jumping off onto the platform below (this may take a few attempts, but the elevator can be activated as many times as needed.)

The Library
On the third floor, you'll come to a room with a large circular room (the Index platform will be above it. Go right and use the crouch jump to jump over the barriers and you'll come to a room that looks like the rest of the level, but is disconnected from the regular game. The Terminal will be plain as day before you even reach it.

Two Betrayals:
In the control room at the beginning of the level, walk around the the circular platform and you'll find the terminal directly across from the control console.

Keyes:
After find Keyes absorbed into the Proto- Gravemind, kill the Covenant and Flood that attempt to ambush you, than search the sunken crevices to the side of the raised platform. The terminal will be down inside one of the two.

The Maw:
Play the level like normal until you reach the Cryogenic Storage Bay where Sentinels will be busy fighting the Flood. A glowing Control console on the wall will house you final terminal.

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Credit goes to Jason Burt on Planet360 for the text.
And also wanna thank Charlie from VGMMDI for messaging me with his YouTube clip

The first terminal available is located as you enter the bridge to talk with Keys for the first time (before you fight any enemies) in the first mission 'Pillar of Autumn'.
The terminal has flashing screens and is on your left (Press the button prompt on your screen to view the video.)

Please note terminals only appear in the game whilst playing in the remastered view, terminals do not appear in classic view. Thanks Drabik for the info.
Edit: It appears as long as you are in the right location you can still interact with the terminal.

Here's a video to show you. (Note i recorded the video after talking to Keys to show you more clearly)

All collectibles in order as they are found

13 skulls and 10 terminals

Easy to follow guide.. Hopefully.... Any questions message me here or on youtube and il do my best to try and help

On the Pillar Of Autumn level, as you enter the bridge to speak to Keys,there is a flashing terminal on your left. Press X to see the transmission from the monitor, and get your first terminal achievement.

I put together this video of all the locations of the terminals and i also have a skull location video on my channel if you would like to check it out.