Mass-effect – DirectX setup Internal Error when installing Mass Effect 3

If you import an ME2 character you automatically use the roleplaying mode (the one with combat and dialog choices), only if you create a new character do you get the choice in the beginning. The roleplaying mode is the one closest to how the previous Mass Effect games worked, so the game assumes that players that import a character would like to play that mode.

The question you link to, How do I complete the mission "Eden Prime: Resistance Movement"?, further links to the wiki entry Eden Prime: Resistance Movement that has a walk-through of how to collect all 3:

After fighting off the initial wave of Cerberus troops, head into the left structure and you will find another piece of intel in the back room with a bunch of computer terminals. The last piece of intel is located in a building with a number 2 on the outside, and the number 9 painted on the inside multiple times (this is misleading - many buildings have a 2 or 9 written in or on them so to avoid further confusion the building with the last piece of intel is located across from the building with a 2 on it that holds the prothean data), as you move deeper inside you will see a wall on the left side with three consoles, it's the middle one.

That is all you have to do to get the achievement and related War Asset. You should get the Achievement immediately after completely that task/mission.

UPDATE: Per comments, looks like the Op found the answer to his own question. You have to do the above, and not die at all between picking up the three items. (My guess is this is probably a bug and not a requirement, but at least we know now.)