Here is the full list of all 10 Sam & Max: The Devil's Playhouse - Episode 3: They Stole Max's Brain! trophies - 5 bronze, 4 silver and 1 gold.
Tracked Max's brain-thieves to the Museum
Foiled an evil alliance and recovered Max's brain
Infiltrated the boy-king's inner circle
Lobotomized the Pharaoh and got Max his brain
Threaten and "Noir" everyone you meet on the street in Act 1
Explore the museum completely
Turn into the Hindenburg in every room and get a bird's eye view of the environment
Have Sammunmak banish every possible object in Act 3
Teleport to every phone in the museum
Turned into every possible object