All of this is 100% confirmed, trust me.
PERKS
Perk Slot 1:
(You have to complete the 'challenge' listed to unlock the 'pro' version)
Marathon
Description: Unlimited Sprint
Unlocked at Rank: 1
Marathon Pro
Description: Climb obstacles faster.
Challenge: Run 26 miles using Marathon.
Sleight of Hand
Description: Faster Reloading.
Unlocked at Rank: 1
Sleight of Hand Pro
Description: Faster Aiming.
Challenge: Get 120 kills using sleight of hand.
Scavenger
Description: Re-supply from dead enemies.
Unlocked at Rank: 13
Scavenger Pro
Description: Extra mags.
Challenge: Re-supply 100 times while using Scavenger
Bling
Description: Two attachments on your primary weapon.
Unlocked at Rank: 21
Bling Pro
Description: +2 secondary weapon attachments.
Challenge: Get 200 kills using a weapon with two attachments.
One Man Army
Description: Change classes at any time.
Unlocked at Rank: 45
One Man Army Pro (You can switch classes at any times, replaces your secondary).
Description: Swap classes faster.
Challenge: Get 120 kills using One Man Army.
Perk Slot 2:
Stopping Power
Description: Increased Bullet Damage.
Unlocked at Rank: 1
Stopping Power Pro
Description: Extra damage versus enemy vehicles.
Challenge: Get 250 kills using Stopping Power
Lightweight
Description: Move faster.
Unlocked at Rank: 1
Lightweight Pro
Description: Quick aim after sprinting.
Challenge: Sprint 30 miles using Lightweight.
Hardline
Description: Killstreaks require one less kill.
Unlocked at Rank: 9
Hardline Pro
Description: Deathstreaks require one less death.
Challenge: Get 40 killstreaks while using Hardline. [2 kills in a row]
Cold-Blooded
Description: Undetectable by UAV, Air Support, Sentrys, and Thermal.
Unlocked at Rank: 25
Cold-Blooded Pro
Description: No red crosshair or name when targeted.
Challenge: Destroy 40 enemy killstreak rewards using cold-blooded.
Danger Close
Description: Increased explosive weapon damage.
Unlocked at Rank: 33
Danger Close Pro
Description: Extra air support damage.
Challenge: Kill 200 people with weapon explosives.
Perk Slot 3:
Commando
Description: Increased melee distance.
Unlocked at Rank: 1
Commando Pro
Description: No falling damage.
Challenge: 20 melee kills while using Commando.
Steady Aim
Description: Increased hip-fire accuracy.
Unlocked at Rank: 1
Steady Aim Pro
Description: Longer hold breath duration.
Challenge: Get 80 hip-fire kills using steady aim.
Scrambler
Description: Jam enemy radar near you.
Unlocked at Rank: 17
Scrambler Pro
Description: Delay enemy claymore explosions.
Challenge: Get 50 close-range kills using scrambler.
Ninja
Description: Invisible to heartbeat sensors.
Unlocked at Rank: 29
Ninja Pro
Description: Your footsteps are silent.
Challenge: Get 50 close-range kills while using Ninja.
Sitrep
Description: Detect enemy explosives and tactical insertions.
Unlocked at Rank: 37
Sitrep Pro
Description: Louder enemy footsteps.
Challenge: Destroy 120 pieces of enemy equipment.
Last Stand
Description: Pull out your pistol before dying.
Unlocked at Rank: 41
Last Stand Pro
Description: Use equipment in Last Stand.
Challenge: Kill 20 people in Last Stand.
ATTACHMENTS
Assault Rifles:
Grenade Launcher: Marksman I -- 10 Kills [Reward XP: 250]
Red Dot Sight: Marksman II -- 25 Kills [Reward XP: 1,000]
Silencer: Marksman III -- 75 Kills with this weapon. [Reward XP: 2,000]
ACOG: Marksman IV -- 150 Kills with this weapon. [Reward XP: 5,000]
FMJ: Marksman V -- 300 Kills with this weapon. [Reward XP: 10,000]
Shotgun: Get 20 Kills with the attached Grenade Launcher. [Reward XP: 750]
Holographic Sight: Get 60 Kills while looking through the red dot sight of this weapon. [Reward XP: 1,000]
Heartbeat Sensor: Get 15 Kills with the silencer attached to this weapon. [Reward XP: 750]
Thermal: Get 20 Kills while looking through the ACOG site attached to this weapon. [Reward XP: 750]
Extended Mags: Get 40 bullet penetration kills with FJM attached to this weapon. [Reward XP: 1,000]
Sub Machine Guns:
Rapid Fire: Marksman I -- Get 10 kills with this weapon. [Reward XP: 500]
Red Dot Sight: Marksman II -- Get 25 kills with this weapon. [Reward XP: 1,000]
Silencer: Marksman III -- Get 75 kills with this weapon. [Reward XP: 2,000]
ACOG: Marksman IV -- Get 150 kills with this weapon. [Reward XP: 5,000]
FMJ: Marksman V -- Get 300 kills with this weapon. [Reward XP: 10,000]
Akimbo: Get 30 kills with rapid fire attached to this weapon. [Reward XP: 1,000]
Holographic Sight: Get 60 kills while looking through the Red Dot Sight attached to this weapon. [Reward XP: 1,000]
Thermal: Get 20 kills while looking through the ACOG Sight attached to this weapon. [Reward XP: 750]
Extended Mags: Get 40 bullet penetration kills with FMJ attached to this weapon. [Reward XP: 1,000]
Light Machine Guns:
Grip: Marksman I -- Get 10 kills with this weapon. [Reward XP: 500]
Red Dot Sight: Marksman II -- Get 25 kills with this weapon. [Reward XP: 1,000]
Silencer: Marksman III -- Get 75 kills with this weapon. [Reward XP: 2,000]
ACOG: Marksman IV -- Get 150 kills with this weapon. [Reward XP: 5,000]
FMJ: Marksman V -- Get 300 kills with this weapon. [Reward XP: 10,000]
Holographic Sight: Get 60 kills while looking through the Red Dot Sight attached to this weapon. [Reward XP: 1,000]
Hearbeat Sensor: Get 15 kills with the silencer attached to this weapon. [Reward XP: 750]
Thermal: Get 20 kills while looking through the ACOG Sight attached to this weapon. [Reward XP: 750]
Extended Mags: Get 40 bullet penetration kills with FMJ attached to this weapon. [Reward XP: 1,000]
Sniper Rifles:
Silencer: Marksman I -- Get 10 kills with this weapon. [Reward XP: 250]
ACOG - Marksman II -- Get 25 kills with this weapon. [Reward XP: 1,000]
FMJ - Marksman III -- Get 75 kills with this weapon. [Reward XP: 2,000]
Heartbeat Sensor: Get 15 kills with the silencer attached to this weapon. [Reward XP: 750]
Thermal: Get 20 kills while looking through the ACOG Sight attached to this weapon. [Reward XP: 750]
Extended Mags: Get 40 bullet penetration kills with FJM attached to this weapon. [Reward XP: 1,000]
Machine Pistols:
Red Dot Sight: Marksman I -- Get 10 kills with this weapon. [Reward XP: 500]
Silencer: Marksman II -- Get 25 kills with this weapon. [Reward XP: 1,000]
FMJ: Marksman III -- Get 50 kills with this weapon. [Reward XP: 1,500]
Akimbo: Marksman IV -- Get 75 kills with this weapon. [Reward XP: 2,000]
Holographic Sight: Marksman V -- Get 100 kills with this weapon. [Reward XP: 2,500]
Extended Mags: Marksman VI -- Get 150 kills with this weapon. [Reward XP: 3,500]
Shotguns:
Red Dot Sight: Marksman I -- Get 10 kills with this weapon. [Reward XP: 500]
Silencer: Marksman II -- Get 25 kills with this weapon. [Reward XP: 1,000]
Grip: Marksman III -- Get 75 kills with this weapon. [Reward XP: 2,500]
FMJ: Marksman IV -- Get 150 kills with this weapon. [Reward XP: 5,000]
Holographic Sight: Marksman V -- Get 250 kills with this weapon. [Reward XP: 10,000]
Extended Mags: Marksman VI -- Get 400 kills with this weapon. [Reward XP: 10,000]
Handguns:
FMJ: Marksman I -- Get 10 kills with this weapon. [Reward XP: 500]
Silencer: Marksman II -- Get 25 kills with this weapon. [Reward XP: 1,000]
Akimbo: Marksman III -- Get 50 kills with this weapon. [Reward XP: 1,500]
Tactical Knife: Marksman IV -- Get 100 kills with this weapon. [Reward XP: 2,500]
Extended Mags: Marksman V -- Get 150 kills with this weapon. [Reward XP: 3,500]
You cannot get a silencer or extended mags on the .44 Magnum or Desert Eagle.
KILLSTREAKS & DEATHSTREAKS
3 Kills:
UAV - Shows enemies of the mini-map.
4 Kills:
Care-Package - Airdrop a random killstreak or ammo.
Counter-UAV - Temporary disables enemy radar.
5 Kills:
Sentry Gun - Airdrop a place-able Sentry Gun.
Predator Missile - Remote control missile.
6 Kills:
Precision Airstrike - Call in a directional airstrike
7 Kills:
Harrier Strike - Airstrike with a hovering harrier.
Attack Helicopter - Call in a support helicopter.
8 Kills:
Emergency Airdrop - Airdrop 4 random killstreaks or ammo.
9 Kills:
Pave Low - Heavily armored assault helicopter.
Stealth Bomber - Airstrike undetectable on enemy maps.
11 Kills:
Chopper Gunner - Be the gunner of an attack helicopter.
AC-130 - Be the gunner of an AC-130.
15 Kills:
EMP - Temporarily disables enemy electronics.
25 Kills:
Tactical Nuke - End the game with a bang.
Deathstreaks
3 Deaths without a kill:
Painkiller - Big health boost when you spawn.
4 Deaths without a Kill:
Copycat - Steal your killers class in kill cam.
Martyrdom - Drop a live grenade just after dying.
Final Stand - Get back up after being wounded.
COD4

Prestige 7
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Prestige 8
Colonel I

Prestige 6

Lieutenant General II


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