20 Taken have been drowned, electrocuted, or dispatched by some other indirect means.

You took out two Taken with a single barrel.

You have destroyed 20 poltergeist objects.

You checked out some important messages.

You have dropped 50 Taken with the hunting rifle.

You have discovered 25 manuscript pages.

Deflect 10 projectiles.

Complete a Stage in any mode in multiplayer.

Perform 10 Team Attacks in multiplayer.

You bought yourself some breathing time with a flare.

You disobeyed the park ranger's instructions.

Unlike Stucky, you enjoy incontestable health benefits. Namely, you're not dead.