Trophies
Too easy
Complete a game on easy with at least one survivor.
You call that a score?
Complete a game with a score of 1000 or more.
It's something
Complete a game on normal with at least one survivor.
That's a little better...
Complete a game with a score of 2000 or more.
Everyone made it!
Have everyone survive in an easy game.
Now that's a score!
Complete a game with a score of 3000 or more.
That's everything!
Unlock everything in a single game.
Kept them sleeping!
Have everyone survive in a normal game.