Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Dart Demon (5 points)	Wicked aim! You reached level 7 (or observed another player doing so) for promotion to Dart Demon.
Dart of the Dead (5 points)	On target! You reached level 4 (or observed another player doing so) to rank as Dart of the Dead.
Earth's Last Hope (5 points)	Salvation! You reached level 10 (or observed another player doing so) to rank as Earth's Last Hope.
Scared Survivor (5 points)	Resilient! You reached level 2 (or observed another player doing so) and made it to Scared Survivor.
Undead Exterminator (5 points)	Payoff! You reached level 8 (or observed another player doing so) to qualify as Undead Exterminator.
Walking Dead Stopper (5 points)	Nailed! You reached level 6 (or observed another player doing so) to become a Walking Dead Stopper.
Zombie Hugger (5 points)	Face your fears! You reached level 3 (or observed another player doing so), rising to Zombie Hugger.
Zombie Hunter (5 points)	Shots fired! You reached level 5 (or observed another player doing so) to progress to Zombie Hunter.
Zombie Nemesis (5 points)	Fearsome! You reached level 9 (or observed another player doing so) to advance to Zombie Nemesis.
Zombie Nerd (5 points)	First steps! You reached level 1 (or observed another player doing so) for the title of Zombie Nerd.