Trophies

Pound the Pavement Pound the Pavement
Tracked Max's brain-thieves to the Museum

Finish Act 1.
Saboteur! Saboteur!
Foiled an evil alliance and recovered Max's brain

Finish Act 2.
All Hail Sammun-Mak All Hail Sammun-Mak
Infiltrated the boy-king's inner circle

Finish Act 3.
Reunited (And it Feels So Good) Reunited (And it Feels So Good)
Lobotomized the Pharaoh and got Max his brain

Finish the entire episode.
Bad Cop/Sad Cop Bad Cop/Sad Cop
Threaten and "Noir" everyone you meet on the street in Act 1

As it says, for each of the three characters in Act 1 use the "Threaten" and "Noir" dialog choices at least once. That's the Sign Spinner, Frankie the Rat, and the Tourist.
The Grand Tour The Grand Tour
Explore the museum completely

Press all twelve buttons on the audio tour during Act 2.
Blimp's Eye View Blimp's Eye View
Turn into the Hindenburg in every room and get a bird's eye view of the environment

During Act 2 turn Sammun-Mak into the Zeppelin in the Egypt exhibit, the main hall, and Papierwaite's office.
Tweenage Angst Tweenage Angst
Have Sammunmak banish every possible object in Act 3

To banish an object you need to approach the Corn-dog Pyramid in the Museum with Max as that object. The objects that he can be are a Storm Cloud, a Toaster, and a Credit Card.
Drop a Dime Drop a Dime
Teleport to every phone in the museum

There are only four phones in the museum, just teleport to them all.
Rhinoplastastic Rhinoplastastic
Turned into every possible object

There are four items in Act 2; the Dog Skull next to Sal, the Hindenburg up the steps, a Pyramid in the Egypt exhibit, and a City in Papierwaite's Office.

There are three items in Act 3; a Credit Card next to Stinky's, a Storm Cloud on the newspapers in Gift Depot, and a Toaster next to Frankie.