Medals
Sneaky ending: File-> (Fight scene) -> Chair-> Right-> Plungers
Legal Ending: Cellphone-> Bag
Badass Ending: Drill-> Crow Bar-> Down-> Left-> Ready your cursor in the center of the screen.
LOL Brawl Reference: Go down instead of left on the badass fight scene.
Secret Medal: On the Credits after the Sneaky ending Click the sun when it zooms out.