Trine 4: The Nightmare Prince

Story-related and cannot be missed.

This trophy is for completing the first level in Act II, Craghill Moors. This is also the first level where you can control all three characters.

At the end of this level, however, you'll have to face the Giant Nightmare Wolf boss, after which the trophy will pop. For info on how to defeat it, see below or watch the video:

This boss is a large wolf whose only attack is to slam down on you, but other enemies will spawn throughout the fight. At first, only two wolves will spawn at a time. You can kill these yourself or you can lead them into the boss's slam down which will also kill them. In the meanwhile, you'll see that the boss has two meters: the red bar is his health while the purple bar is his armor in a sense. Hit him a few times until the purple bar runs out, at which point the boss will become stunned. Using Pontius, use the platforms to jump on his head and then slam down ( to jump, then press in the air) on him. Repeat this five more times. On the sixth, the boss will die.

One other thing to note, somewhere around the third time, a new enemy will start to spawn as well who throws green grenades at you which will explode after a few moments and kill you so be sure to run away from those.