Chaos on Deponia (EP)

In Act III, you must play a radar minigame involving three dolphins with torpedoes stuck to their bodies chasing a submarine. If you skip the minigame, you will void the trophy.

This puzzle is randomized (though the starting positions are always the same). The gist of it, is that you need to get one of the dolphins on top of the submarine. The arrows at the bottom control your dolphins – each dolphin gets a move (you can't control the order) then the submarine will move. The general rule is to keep your dolphins facing the submarine as much as possible – the submarine won't approach a dolphin that is facing it. Try to get the submarine into the bottom left area as that has a straight wall you can work with to trap the sub against and use the dolphins in a pincer attack. I also did this fairly quickly with the submarine in the top left area. Eventually you'll be successful. If you mess up, you can hit the red button in the top left to reset the starting positions.

The trophy will unlock when you finally regain control of Rufus.