Successfully complete the indicated task to unlock the corresponding perk.

Perk	How to unlock
Level 5 Berserker	Deal 3,500,000 damage with melee weapons.
Level 5 Commando	Kill 4,000 stalkers with the Bullpup, and deal 3,500,000 damage with Bullpup.
Level 5 Field Medic	Heal 25,000 HP on your teammates.
Level 5 Firebug	Deal 3,500,000 damage with the Flamethrower.
Level 5 Sharpshooter	Get 5,500 headshot kills with the crossbow, handcannon, or rifle.
Level 5 Support Specialist	Deal 3.5m damage with shotguns, and weld 250,000 door points.