Left 4 Dead: PerksLeft 4 dead Perks
Anti Tank Unit: +15% Damage to The Tank
Unlock: Inflict 120,000 damage to Tanks and acquire either the Tankbusters or Man Vs Tank achievement.
Heavy Hitter: Larger punch reach and cone, double punch damage and increased chance of knockdown. Increased chance of hitting hunters out of the air.
Unlock: Punch 250 common or special infected to death and acquire any two of the following achievements: Dead Stop, Hunter Punter, Clean Kill, Spinal Tap.
Head-Hunter: +25% Damage to Headshots on any infected, and a +5% damage to Hunters
Unlock: Kill 5 Hunters with a headshot and acquire either the Jump Shot or the Brain Salad achievement.
Light Step: If you walk slowly, the aggro area of idle infected and the Witch becomes much smaller for you
Unlock: Kill less than 1000 infected through-out an entire campaign
Witch Hugger: Gives you the option to hug the wi