Pushing Boxes Trophy in The Psychoduck

Story related. Cannot be missed.

Beginning with Level 11, a new type of grey block designated with a crown on it will make its debut. These blocks can be pushed and are beneficial when you need to hide from the guards while moving them to approach the heron easily in this level, but be sure to keep a good distance while doing so since you can still be caught by the guards if you aren't careful enough with the pushable blocks.

As usual, this trophy will be unlocked once you complete the eleventh level for the first time.