Collect 49 Scout Flies

Collect 25 Power Cells

Navigate the Purple Precursor Rings

Collect 28 Scout Flies

Herd the Yakows in to their Pen

Push the Flut Flut Egg Off the Cliff

Open the Precursor Door

Upgrade all weapons to level 6.

Scare at least one of every type of enemy using the Nightmare Box.

Beat the game in Challenge Mode.

Upgrade 1 weapon to level 6.

Purchase all weapons.

Collect 200 raritanium over the course of the game.