This is a storyline achievement which can be achieved in Mombasa Streets. However, if, like me, you decided to just use level select to choose what missions to play, then you can miss this achievement.
To get this achievement, load up Mombasa Streets with Rally Point 4 (Remote Detonator), and follow VISR directions to get to the Remote Detonator, and then pick it up by holding
. This will award you this achievement.
If you get lost or go into a dead end, you can get helpful directions from your VISR by pressing either
to get an 'emoticon' target locator to appear.
After you go through the door when your 'distance to beacon' hits 0.0m, go forward, up the ramp, and just in front of you, slightly to the left, in front of the destroyed bridge, is the Remote Detonator.