Fill the Nitrous bar then use it all in one go without hitting anything

Shoot down five flying crows in the story.

Destroy a Goat of Warding.

Survive the lycan attack.

Achieve Victory in multiplayer

Select a Final Talent during a game

Select an Ultimate ability during a game

Level up a Hero during a game

Hacked Arrow's soul.

Finish chapter 1.

Discover 5 Points of Interest.

Take Knifey's advice and stab Gene in the gut.