This achievement is story related and cannot be missed. It is gained during Film 1 - Chapter 4 - Smuggler's Den, after leaving the underground area for the first time. Right after getting the achievement
The Green Flash, go north and you'll find a spyglass at the edge of the cliff for you to use, and you'll get this achievement.
If you're having trouble getting through the level, check this guide for a more detailed breakdown of the puzzles: