Start ... (Level 1)
Score 5,000 points. To raise the icon level, Score 250,000 points

Fighter Infection (Level 1)
Kill 25,000 Infected. To raise the icon level, Kill 50,000 Infected

Bare arms (Level 1)
Kill 2,500 enemies with melee weapons. To raise the icon level, Kill 10,000 enemies with melee weapons