Achievements:ACHIEVEMENT – HOW TO UNLOCKCo-Op – Beat Wave 5 with another player on Xbox Live on the default settings.Co-Op Master – Beat Wave 10 with another player on Xbox Liveon the default settings.Dodge – Survive Wave 1 for 28 seconds without dying on the default settings.Glue – Beat Wave 1 without moving or dying on the default settings.High Score – Get first place on the game score board on the default settings.Save All Humans! – Save all humans on Waves 1 and 2 on the default settings.Time Challenge – Reach Wave 4 in under 45 seconds on the default settings.Versus – Get a rank of 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.