Play a round on all Dragon's Teeth maps

Completely upgrade all weapons.

Who wouldn't reach out for a man clinging for his life? (Ch. 6)

I'm not taking any chances, this bus can't take much more damage. (Ch. 12)

Get a kill in the ACV

Use a secret explosive weapon to kill 10 enemies. (Agony Bolt effects negate results)

Have they lost their minds? Better get past them without a fight. (Ch.2)

Completely upgrade one weapon.

Collect every collectable in the game.

Complete the game on Casual difficulty.

Defeat the ultimate evil within.

Open up all the lockers in the save room.

Remove an invisible enemy from the equation.