Once you complete the 4th main quest, "The Embassy," you'll pick up a new ability: Glide. Jump into the air and hold  to activate Glide (cancel with ). To get this trophy, you'll need to use Glide uninterrupted for at least 60 seconds. This is easy in theory; you just need to find a high enough peak to jump from so you'll have enough distance to last for that long. There are several spots you can do this from as all you really need is a very tall mountain, of which there are many in the game.

TIP: If you haven't gotten this trophy by the time you've completed the 16th main quest, "The Wings of the Ten," you can easily do this using your Flying Mount. Mount the Sunhawk, fly super high up, then dismount mid-air and glide down.

Here's a video containing 2 of the best locations, both of which are relatively early in the game:

Completed a Long Glide Video Guide

1. [0:25] Near The Bulwark, which you'll reach as part of the 8th main quest, "The Broken Sky."
2. [1:55] You'll pass by this spot during the side-quest "Signal Spike."

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WHERE TO ACHIEVE IT
Side Quests	Exploration	Flying Mount
An Errand in the northwest corner of the map, called "Call and Response" will take you to an elevated watchpost from where you cam jump and glide to the ground. There is also a side quest "Forbidden Legacy" in which you climb a very tall building with Alva, from where you can jump off and glide.	There are 3 main areas in which you can attempt this: The snowy mountains north of The Bulwark Old San Francisco area, from the tall buildings around Landfall. The mountains surrounding The Base.	Alternatively (and a lot easier) you can wait towards the end of the storyline, to complete the Main Quest "The Wings of the Ten" in which you will unlock the ability to use a Flying Mount. Once you have a mount you could fly up into the sky and then jump off and glide back down to earth.
Whichever way you decide to attempt this, as long as you are gliding uninterrupted for 60 seconds the trophy will unlock.

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Gliding Around

Gliding 60 secs from a Flying Mount: