Complete the 2nd floor in Zero Tolerance

Complete the 3rd floor in Zero Tolerance

Complete the 4th floor in Zero Tolerance

Kill 10 enemies consecutive with the punch on the last floor unlocked in Zero Tolerance

Have a shotgun filled with ammo in Zero Tolerance

Complete a floor without losing any soldier in Zero Tolerance

Pass the level with at least 90 health points in Zero Tolerance Underground

Pass the level with less than 30 health points in Zero Tolerance Underground

Complete a floor without getting a medkit in Zero Tolerance

Kill 25 enemies with the handgun on the last floor unlocked in Zero Tolerance

Kill 50 enemies with the handgun on the last floor unlocked in Zero Tolerance

Kill 100 enemies with the handgun on the last floor unlocked in Zero Tolerance

Kill 25 enemies with the shotgun on the last floor unlocked in Zero Tolerance

Kill 50 enemies with the shotgun on the last floor unlocked in Zero Tolerance

Kill 100 enemies with the shotgun on the last floor unlocked in Zero Tolerance

Kill 25 enemies with the flamethrower on the last floor unlocked in Zero Tolerance

Kill 50 enemies with the flamethrower on the last floor unlocked in Zero Tolerance

Kill 100 enemies with the flamethrower on the last floor unlocked in Zero Tolerance

Complete a level only using the handgun in Zero Tolerance

Complete a level only using the shotgun in Zero Tolerance

Complete a level without clearing the floor in Zero Tolerance Underground

Complete the First Floor in Zero Tolerance