CoD: Black Ops Perks

Perk 1

perk thumbnail
character thumbnail
Name: Lightweight
Cost: 2000
In-Game Description: Move Faster
Pro Version: + No Fall Damage
Challenges:
Melee Kills - Earn 15 melee kills.
Escape Death - Escape death 5 times after being hurt.
Offense Medals - Get 10 Offense Medals by killing enemies near their objective.

Tips for Unlocking Pro: Lightweight Pro can be unlocked very quickly by just playing the game, particularly objective gametypes.
perk thumbnail
character thumbnail
Name: Scavenger
Cost: 2000
In-Game Description: Pick up ammo from fallen enemies. Replenish lethal grenades.
Pro Version: + Start with extra mags. Replenish tactical grenades.
Challenges:
Resupplies - Resupply 150 times while using Scavenger.
Grenade Kills - Get 5 Lethal Grenade kills with a resupplied grenade.
Kill Count - Get 5 kills without dying 5 times.

Tips for Unlocking Pro: For the 2nd challenge, toss your grenade pretty early after spawn. That way you'll be forced to use a scavened one if found. As for the third, getting to a 5 kill killstreak shouldn't be too difficult - just be sure to use low level killstreaks and UAV to improve your odds of getting those kills.

perk thumbnail
character thumbnail
Name: Ghost
Cost: 2000
In-Game Description: Undetectable by the Spy Plane and the Blackbird.
Pro Version: + Undetectable by aircraft, dogs, IR, and sentries. No red crosshair or name when targeted.
Challenges:
Concealed Kills - Kill 20 enemies while they have a Spy Plane or Blackbird active.
Destroy Aircraft - Destroy 30 aircraft with any non-Killstreak launcher.
Destroy Sentry Gun - Destroy 1 Sentry Gun.

Tips for Unlocking Pro: Although you can use one of the earlier launchers, I'd recommend waiting until lvl 30 and unlocking the Strela. At that point, just always use it as your secondary, and pick off UAV's and other aerial killstreaks as they come up. As for the sentry gun challenge, it can be achieved pretty easily as you're bound to come across one. If you're having bad luck though, try using the sentry gun killstreak and letting an opponent steal it, just to destroy it afterward.

perk thumbnail
character thumbnail
Name: Flak Jacket
Cost: 2000
In-Game Description: Reduces explosive damage.
Pro Version: + Immune to fire damage and allows you to safely toss back frag grenades.
Challenges:
Protected - Survive 10 explosions while using Flack Jacket.
Demolished - Plant or defuse 10 bombs in Demolition, Sabotage, or Search & Destroy.
Throwbacks - Throw back 5 enemy Frag Grenades.

Tips for Unlocking Pro: Play demolition for the 2nd challenge, and just keep using the perk for the 1st and 3rd. Grenades are thrown around often enough, especially toward flags in objective-based games. Try taking B in a game of Domination, for example, and you'll probably have a grenade thrown at you nearby. Also, if you encounter Firing Range, try climbing up the ladder and camping in the fort. Shoot at enemies, or even do random bursts so that you show up on enemy radar - you'll have grenades thrown up there in no time. Then just survive them if they're stickies, and throw them if regular grenades.

perk thumbnail
character thumbnail
Name: Hardline
Cost: 2000
In-Game Description: Killstreaks require 1 less kill
Pro Version: + Change the contents of a Care Package.
Challenges:
Share Packages - Share 10 Killstreak reward crates with teammates.
Multiple Killstreaks - Earn 7 Killstreaks in one match while using Hardline.
Killstreak - Get 7 kills without dying in one match.

Tips for Unlocking Pro: Basic surviving tips apply. Use UAV to rack up a number of killstreaks, and use it to your advantage to get to that 7 killstreak.

Perk 2

map thumbnail
Name: Hardened
Cost: 2000
In-Game Description: Bullets penetrate better.
Pro Version: + Increased damage to aircraft and turrets, reduced flinch and recoil when shot.
Challenges:
Penetration Kills - Get 10 kills using Hardened and shooting through walls.
Bullets in Aircraft - Shoot 200 bullets into enemy aircraft.
Equipment Shot - Destroy 1 piece of enemy equipment through a wall.

Tips for Unlocking Pro: Use hacker to search for the enemy equipment.

map thumbnail
Name: Scout
Cost: 2000
In-Game Description: Hold breath longer.
Pro Version: + Quicker aiming after sprinting and quicker recovery from knife lunge.
Challenges:
Secondary Kills - Get 50 kills with secondary weapons.
One Shot Kills - Get 50 One Shot, One Kill medals.
Headshots - Get 50 headshot kills.

Tips for Unlocking Pro: Although the pistols are great, using a launcher such as the RPG can help in getting those 50 secondary-weapon kills. As for the other challenges, you'll unlock them just by using snipers regularly.

map thumbnail
Name: Steady Aim
Cost: 2000
In-Game Description: Increased hip-fire accuracy.
Pro Version: + Quicker aiming after sprinting and quicker recovery from knife lunge.
Challenges:
Quick Melee - Melee two enemies consecutively within 5 seconds.
Sprint Kils - Get 100 kills after sprinting.
Hip Fire Kills - Get 150 hip fire kills using Steady Aim.

Tips for Unlocking Pro: Run with a pistol secondary or ballsitic knife for the knife kills, and use a submachine or shotgun for the sprinting and hipfire kills.

map thumbnail
Name: Sleight of Hand
Cost: 2000
In-Game Description: Faster reloads.
Pro Version: + Faster aiming down sights with non-scoped weapons.
Challenges:
Aiming Kills - Get 150 kills while aiming down sights.
Reload Kills - Kill an enemy within 5 seconds of reloading 30 times.
Fast Hand Kills - Reload and finish off the enemy you wounded 10 times.

Tips for Unlocking Pro: For Fast Hand Kills, shoot at em a couple times and do a quick reload behind some cover before finishing the job.

map thumbnail
Name: Warlord
Cost: 2000
In-Game Description: Equip two attachments to your primary weapon.
Pro Version: + Start with 1 extra lethal and tactical grenade (except smoke).
Challenges:
Two Attachment Kills - Get 150 kills using a gun with two attachments.
Grenade Kills - Get 10 Frag or Semtex Kills.
Grenade Multi-kills - Get 1 multi-kill with Frag or Semtex.

Tips for Unlocking Pro: For the third challenge, try throwing a cooked grenade at B on Domination for a possible multi-kill.

Perk 3

map thumbnail
Name: Marathon
Cost: 2000
In-Game Description: Longer sprint.
Pro Version: + Unlimited sprint.
Challenges:
26 Miles - Sprint 26 miles using Marathon.
First Blood - Get the First Blood Medal 10 times.
Captures - In Capture the Flag, get the Flag Capture Medal 15 times while using Marathon.

Tips for Unlocking Pro: In combination with leightweight, you'll be able to cover ground a lot faster to get the first challenge. The second should occur on its own at some point - just try to predict the flow of the map. As for the third, run with the Ak74u, and use tactical insertion at their flag to keep grabbing it.

map thumbnail
Name: Ninja
Cost: 2000
In-Game Description: Silent movement.
Pro Version: + Completely silent, and louder enemies.
Challenges:
Silent Kills - Get 150 kills using the Suppressor attachment.
Back Stabs - Get 5 Backstabber Medals.
Plants - Plant the bomb 10 times in Demolition, Sabotage, or Search & Destroy.

Tips for Unlocking Pro: Use a silenced weapon and Ghost so that radar won't give you away as you approach an enemy for a knife kill from behind.

map thumbnail
Name: Second Chance
Cost: 2000
In-Game Description: Pull out your pistol before dying.
Pro Version: + Survive longer and any teammate can revive you.
Challenges:
Kills - Get 10 kills while in Second Chance.
Revenge - While in Second Chance, kill the enemy who downed you 5 times.
Headshot - Get 1 headshot kill while in Second chance.

Tips for Unlocking Pro: Use the python as your secondary for easy kills while in Second Chance. As for the headshot, just keep trying.

map thumbnail
Name: Hacker
Cost: 2000
In-Game Description: Ability to detect enemy equipment and explosives.
Pro Version: + Ability to sabotage enemy equipment, turrets, and crates. Invisible to Motion Sensors.
Challenges:
Destroys - Destroy 10 equipment or explosives while using Hacker.
Explosive Kills - Kill 25 enemies with a Claymore or C4.
Near Equipment Kills - Kill 25 enemies within the radius of your Jammer or Motion Sensor.

Tips for Unlocking Pro: Play objective based games and try playing defensively, guarding the flag or bomb site, headquarter, etc, after having placed the motion sensor or jammer.

map thumbnail
Name: Tactical Mask
Cost: 2000
In-Game Description: Reduces the effects of flash and concussion grenades.
Pro Version: + Reveals locations of flashed or stunned enemies.
Challenges:
Flash Kills - Kill 20 enemies that are blinded by your Flashbang.
Concussion Kills - Kill 20 enemies that are stunned by your Concussion Grenade.
Nova Gas Kills - Kill 20 enemies poisoned by your Nova Gas.

Tips for Unlocking Pro: Secondary first, shoot after. And be sure to shoot while they're still affected by the grenade.