~Stay in the air for more than 45 seconds~

Explanation:

The easiest way to get this trophy is to wait until you have completed the game, and have unlocked the concrete power. You can consume concrete from fallen enemies. With this power, you can hover in the air for an exceptional amount of time. What you want to do is head to any tall building, with the concrete power equipped. Now, you can buy the "Double Jump" and "Triple Jump" abilities so you can get much higher in the air, but this isn't needed depending on how high the building you have climbed is. Now all you need to do is jump off the edge of the building and hover using either (X) or L1. If you have the two aforementioned abilities then you can let go of either (X) or L1 and then press either one again to jump in the air to get higher. Here is a video showing you how it is done:



If you don't want to wait until post game, you can do this after unlocking the Video Power. It's unlocked automatically during the second half of the story. You also have to buy the "Airwave" ability from the Video skill tree. Go to the tallest skyscraper on the northern island. It is located in Belltown district in the north-eastern part of the map. Make sure you have the Video Power activated, climb up the building and fly into a satellite dish to be tossed into the air. Once you are in the air, hold down (X) to glide and immediately pull back the left stick. The Airwave ability will now kick in and you drop significantly slower. It will take well over a minute until you reach the street level. Note that the trophy will not unlock until you hit the ground, so you'll need to time it yourself if you want to know when it is safe to fall.