Owlboy

Story related and cannot be missed.

This trophy will be yours after you've defeated the boss of Vellie Cave.

You'll need Geddy to unlock this area. Fly down and break some stuff to enter the new area and you'll find the cave entrance down to the left of this area.

At the end of the cave you'll have to defeat a boss. This boss has a shell, so you will need to beat him with before being able to shoot him with while grabbing Geddy. Do that a couple of times until he dies. Soon after, you'll receive the strange device that will allow you to teleport your friends near you, as well as the trophy.