There are a number of challenges related to perks. Do you need to complete them in order to get the "pro" level of that perk ?
2 Answers
Yes you do, here are the challenges:
Tier 1
Lightweight - Move faster
Lightweight Pro - Move faster + 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.
Scavenger - Replenish ammo and Lethal Grenades from fallen enemies
Scavenger Pro - Replenish ammo and Lethal Grenades from fallen enemies + Start with extra mags and replenish Tactical Grenades from fallen enemies
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.
Ghost - Remain hidden from enemy Spy Planes
Ghost Pro - Remain hidden from enemy Spy Plans + Avoid targeting from aircraft, IR scopes, and Sentry Guns. 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.
Flak Jacket - Take less explosive damage
Flak Jacket Pro - Take less explosive damage + Deflect fire damage and 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.
Hardline - Earn killstreak rewards with one less kill
Hardline Pro - Earn killstreak rewards with one less kill + 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.
Tier 2
Hardened - Penetrate walls and objects with deeper bullet impact
Hardened Pro - Penetrate walls and objects with deeper bullet impact + inflict extra bullet damage on aircraft and turrets, and flinch less 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.
Scout - Hold breath longer when scoped
Scout Pro - Hold breath longer when scoped + switch weapons faster
Challenges
- Secondary Kills - Get 50 kills with secondary weapons.
- One Shot Kills - Get 50 One Shot, One Kill Medals.
- Headshots - Get 30 Headshot kills.
Steady Aim - Maintain increased accuracy when firing from the hip
Steady Aim Pro - Maintain increased accuracy when firing from the hip + aim faster after sprinting and recover quickly from knife lunges
Challenges
- Quick Melee - Melee two enemies consecutively within 5 seconds.
- Sprint Kills - Get 100 kills after sprinting.
- Hip Fire Kills - Get 150 hip fire kills using Steady Aim.
Sleight of Hand - Reload weapons faster
Sleight of Hand Pro - Reload weapons faster + aim down sights faster with weapons (except Sniper Rifles)
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.
Warlord - Equip two attachments to your primary weapon (excluding underbarrels)
Warlord Pro - Equip two attachments to your primary weapon (excluding underbarrels) + start with one extra Tactical and Lethal Grenade (except Willy Pete)
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.
Tier 3
Tactical Mask - Protect yourself against Nova Gas
Tactical Mask Pro - Protect yourself against Nova Gas + reduce the effects of Flash and Concussion Grenades, and reveal the position of a flashed or stunned enemy.
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.
Marathon - Sprint for a longer duration
Marathon Pro - Sprint for a longer duration + sprint for an unlimited duration
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.
Ninja - Move silently
Ninja Pro - Move silently + make no noise at all and hear enemies louder
Challenges
- Silenced 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.
Second Chance - Pull out your pistol before dying
Second Chance Pro - Pull out your pistol before dying + survive longer and get revived by your teammates
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.
Hacker - Detect enemy equipment, explosives and turrets
Hacker Pro - Detect enemy equipment, explosives and turrets + sabotage enemy equipment and turrets, booby trap stolen crates and remain 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.
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Very detailed, but you didn't actually answer the question... "Do you need to complete them in order to get the "pro" level of that perk ?"– TorpeshCommented Feb 18, 2011 at 20:44
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1@Torpesh it is pretty obvious from the answer that the challenges I listed need to be completed...– theoriseCommented Feb 18, 2011 at 20:47
Yes, completing the challenges for each individual perk will unlock its pro level.