This trophy unlocks once you navigate to almost any planet in the galaxy, scan it, and launch a probe.
Once you are onboard the Normandy, use the Galaxy Map, and travel to planet which says unexplored. Press the X button to gain orbit of the planet, and then the triangle button to begin the scan.
Use and hold L2 to move the scanner with the left analog stick, until the graph at the right spikes a certain mineral. Press the R2 button to launch a probe and collect the resources. The trophy will then unlock.
This gets really boring doing this throughout the game, and you will need to do it for a lot of the upgrades. Check out the Mass Effect Wikia for more detailed information
http://masseffect.wikia.com/wiki/Planet_ScanningAt least the devs had some fun with it. Check out the spoiler for an easter egg.
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