Achievements:ACHIEVEMENT – HOW TO UNLOCKCamper – Reach 120 seconds in Wave 1 without dying on the default settings.Flawless – Beat Wave 1 without dying on the default settings.Co-Op – Beat Wave 5 in Xbox Live with another player on the default settings.Co-Op Master – Beat Wave 20 in Xbox Live with another player on the default settings.High score – Reach 1st place on the game score board on the default settings.Pterodactyl – Defeat a Pterodactyl.Triple Pterodactyl – Defeat three Pterodactyls in a game on the default settings.Versus – Reach rank 5 in Xbox Live Ranked Versus mode.Wave 5 – Reach Wave 5 on the default settings.Wave 10 – Reach Wave 10 on the default settings.Wave 30 – Reach Wave 30 on the default settings.Wave 100 – Reach Wave 100 on the default settings.