Town Musicians of Bremen Trophy

Story-related and cannot be missed.

You need to increase your Deersaster level in the first area to "A". Do this by destroying cars, trees, buildings etc. and dealing with the police that come after you. Once you reach Deersaster level "A", the DOGGO boss will spawn in.

Use your guns and other weapons to shoot its legs and knock it down, then shoot the police cars on its shoulders to reveal large red buttons. Finally jump up and hit those buttons then finish the DOGGO off with more gunfire. The Metal Deer from Kept You Waiting?   is super helpful here.

See I am Deeeer.  for a full Walkthrough of the game!