This trophy is found in chapter 4 of Ada's campaign. Below is a video showing you the exact point in the level where the requirements for this trophy begins and ends. The second set of search lights are the most challenging portion of this section. When moving into the first set of cover, push down the L3 analog button and X at the same time to hug the cover as displayed in the video. It may help to practice a bit getting into cover before going for this trophy, just so you can get the hang of it.
Credit to PowerPyx for the video