Behind The Curtain trophy tip
During Chapter 6, leave the cave in the boat and go down the waterway until you see a red waterfall to the right. Go through the falls to enter a secret cave and earn the "Behind The Curtain" trophy.
Love Birds trophy guide
During Chapter 1, find the bird cage across the farm house near the water wheel. Open the cage to free the bird. When you reach the settlement built into a mountain in Chapter 4, locate a stairway leading down to a landing with a telescope on the rail. Use the telescope to look down and to the right to locate a lone bird sitting on a tree branch in the valley, near the rocks with flowers and bushes; watch the bird long enough and it will eventually be joined by the bird you freed back in the first chapter.
Turtle Soup trophy guide
During Chapter 6 you will find a large turtle on an ice shelf. You can help the mother locate her three baby turtles.
The first can be found the right of the mother, after climbing a ledge and dropping down to another area.
The second can found by helping your brother onto the ledge to the right; push the baby turtle onto the slope to help it slide back down.
The third baby turtle is atop the slope to the left; again, push it back down, near the mother.
Now help push the three baby turtles into the trench of water; they should then swim to their mother, earning you the trophy in the process.
Behind The Curtain trophy tip...