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.