Watch all of the Mongrel window movies

Find P

Activate/enter the first Zipkicker 

Solve the puzzle in the Scaley Room

Solve 5 Puzzles

Read all of the stories in Hall of Heroes (click each of the 8 panels)

Solve the JeffersAnt Puzzle (give him the feather)

Use Beak Beak to discover the Hall of Heroes Names 

Use all Father Statues

Solve the Robot Puzzle

Solve 10 Puzzles

Collect all P-tonium Pieces from P

Pull lever to activate language translations

Start All  4 Engines

Solve the console puzzle in Emerald Room