Mass Effect 3

This is a collectible achievement and is therefore missable if you're not paying attention.

None of these are hidden in the sense that they're tucked away in awkward corners or anything. Once you're in the building they're located in, sweep your gun around until you target something, just as you would look for any other item.

Intel #1: Regarding the colonists' sons and daughters. Found in a terminal in the only building you can enter prior to summoning the elevator. If you miss this and fail to acquire it before finding the pod, don't despair. You will eventually need to return to the pod only to discover Cerberus has retracted the bridge. A handily placed set of ladders will bring you down near this building; simply head into it before returning to the pod.

Intel #2: Regarding Cerberus troop deployments. Immediately after finding the pod, Cerberus troops will land and start attacking. Defeat the first wave, and head into the first building on your left after the bridge. Head to the end of the room and turn right - the intel will again be in a terminal more or less in front of you. This must be done before you return to the pod.

Intel #3: Regarding a double-agent of Cerberus'. There are two terminals that will give you information about the contents of the pod. One can only be accessed by bypassing a door and the other can be walked into normally. Directly across from that door that needs bypassing will be a building that houses this intel. It will be in a large computer setup with four monitors and is the only thing in that room. This must be done before you return to the pod.

There are three main pieces of intel to collect. They're fairly obvious but you may walk past them if you're not much of an explorer. If you manage to complete this mission without collecting the intel from each terminal you will have to either reload a previous save or collect the intel on a new playthrough.

Intel 1: This first one is located in the first building you come to on your right hand side with a "6" marked on the side.

Intel 2: The next is just across the bridge after you raise the lift. The building will be on your left hand side marked with a "5".

Intel 3: The last intel for this achievement is located in a building just across from intel 2 in the building marked with a "2". This last terminal doesn't look like the previous two. It looks more like a research computer over a general terminal.

You can interact with all these terminals as long as you don't return to the pod for the final battle in this area. If you're having difficulty locating these terminals the video below will show you all the locations.

There are 3 terminals you need to access for the achievement. achievement unlocks after you get number 3.
1) The first one is before you cross the bridge.
2) after the 1st encounter with Cerberus check the building on the left for number two.
3) you will find number 3 in the building across from the one containing the pod info.

This video shows both the EARLIEST, and EASIEST possible way to grab yourself this Achievement.

Full instructions are given in the video, along with hints and tips.