-Default title (level 1)

-Reach Rank "Private I (level 2)

-Reach Rank "Sergeant"(level 20)

-Reach Rank "Sergeant Major II"(level 28)

-Reach Rank "Captain"(level 44)

-Reach Rank "Colonel"(level 52)

-Reach Rank "Major General II"(level 76)

-Unlocked at Commander (Lv80)

-Sarge
Unlocked at Prestige 1 (Lv25)

-30 something
Unlocked at Prestige 1 (Lv35)

-High Command
Unlocked at Prestige 1 (Lv45)

-A Major Pain
Unlocked at Prestige 1 (Lv55)

-Schooled
Unlocked at Prestige 1 (Lv65)

-Back Again
Unlocked at Prestige 1 (Lv75)

-The Prestige
Unlocked at Prestige 1

-Round 2
Unlocked at Prestige 2

-ThirdTimeCharm
Unlocked at Prestige 3

-4 The Record
Unlocked at Prestige 4

-Five Sided Fistagon
Unlocked at Prestige 5

-6 Feet Under
Unlocked at Prestige 6

-Lucky 7
Unlocked at Prestige 7

-Hard Eight
Unlocked at Prestige 8

-9Lives
Unlocked at Prestige 9

-Prestige 10
Unlocked at Prestige 10

-Far Superior
Unlocked in the Prestige Shop (Regular Package)

-Supreme Being
Unlocked in the Prestige Shop (Hardened Package)

-Pure Talent
Unlocked in the Prestige Shop (Veteran Package)

-Elite
Unlocked via Call of Duty Elite (Elite Premium)

Unlocked via Call Of Duty Elite (Elite Founder)

Have a elite clan that is level 5

Have a elite clan that is level 15

Have a elite clan that is level 30

Have a elite clan that is level 40

Have a elite clan that is level 50

-Sidekick
Get 3 kills in one life with your secondary weapon

-NBK
Get 3 longshots in one life

-Flyswatter
Shoot down an enemy helicopter

-Early Detection
Kill 3 enemies while they are planting a bomb

-Cluster Bomb
Kill 5 enemies with a single air strike

-Rival
Kill the same enemy 5 times in a single match

-#1 Stunner
Finish an enemy off by hitting them with a Stun Grenade. (Direct impact)

-The Denier
Kill an enemy before they earn a 10 or higher killstreak reward

-So Intense
Defuse 2 Bombs

-Quickdraw
Hurt an enemy with a primary weapon, then finish them off with a pistol

-(Absentee Killer)
Get a game winning killcam with a Sentry Gun

-(Enemy of the State)
Kill 3 enemies while you are the only surviving member of your team

-Bomb's Away
Kill 6 enemies with a single Stealth Bomber

-(The Mad Bomber)
Plant 2 bombs

-(Explosive Ordinance)
Win 15 Search and Destroy Matches

-Afterburner
Call in an airstrike 2 times in a single match

-Death from Above
Get a Game Winning Killcam with an AC-130

-(The Invincible)
Get 5 health regenerations from enemy damage in a row, without dying

-(Hard Target)
Get a 2 kill streak with bullets while in mid-air

-(Wargasm)
Get all 3 killstreak rewards within 20 seconds

-(The Avenger)
Avenge a fallen teammate

-(Tag! You're it!)
Kill 5 enemies with thrown back grenades

-(Laying the Boom!)
Kill a bomb carrier in Sabotage or Search and Destroy

-(Techno Killer)
Get a Game Winning Killcam with a Stealth Bomber

-(OG!)
Get a Game Winning Killcam with an Attack Helicopter

-(Smile For The Camera)
Get a Predator missile kill in the Game Winning Killcam

-(Unbelieveble)
Get a throwing knife kill in game winning killcam

-(Blunt Trauma)
Kill 2 enemies with the shield melee attack

-(Owned)
Final Kill Cam with a Riot Shield

-Top Gun
Call in an attack helicopter 2 times in a single match

-(Live Long…)
Survive 5 Consecutive Minutes

-(Flatliner)
Get a 3 or more kill streak while near death (Screen Flashing Red)

-(Blood Brothers)
Win 15 Team Deathmatch matches

-Kill 1 enemy while being stunned by a stun grenade

-(Stickman)
Stick a Semtex to the enemy in a Game Winning Killcam

-(Stuck on You)
Stick 15 players with a semtex grenade

-(It's Personal)
Hurt an enemy then finish them with a Throwing Knife

-(New Jak)
Get a Payback with a Throwing Knife

-(The Legend)
Be the last man standing in Search and Destroy

-(Transformer)
Get a Game Winning Killcam with a Pave Low

-The Mastadon
Play an entire match of any game type with a 5:1 kill/ death ratio

-(All Your Base)
Kill every member of the enemy team (at least 4 enemies) without dying

-(The Bigger They Are…)
Kill the top player 3 times in a row

-(The Harder They Fall)
Kill the top player 5 times in a row

-(Money Shot!)
Get a Payback in the game winning killcam

-(Rainmaker)
Get a payback that sticks to the victim

-(Time is Money)
Get payback 5 times with semtex

-(I'm Rich)
Get payback 5 times with C4

-(Mad Man)
Get Payback 5 times with Frag Grenades

-(Blood Money)
Get Payback 5 times with headshots

-(Heads up!)
Kill an enemy by dropping a crate on them

-(Droppin' Crates)
Get a Game Winning Killcam by dropping a crate on the enemy

-(Mach 5)
Fire an entire SMG magazine into your enemies without missing

-(Drifter)
Destroy a Car

-(Dishes are done)
Get a payback with a claymore

-(Devastator)
Kill every member of the enemy team. (4 enemy minimum)

-(Omnicide)
Kill the entire enemy team within 10 seconds

-Backsmasher
Crush an enemy from behind (riot shield)

-(Streaker)
Kill 10 enemies in a single match without dying

-(To The Extreme)
Win a Team Hardcore Match with the top score

-(All Pro)
Headshot two or more enemies with a single bullet

-(The domino effect)
Kill an enemy by setting off a chain reaction of explosives

-(Public Enemy)
Play team deathmatch and get the top score overall

-Accident Prone
Fall 15 feet or more and survive

-(No)
Kill an enemy cooking a frag grenade

-(Smash Hit)
Get a 3 kill streak with the Riot Shield without dying

-(The Ripper)
Get a 3 melee kill streak without dying. lvl 70

-(Surgical)
Fire an entire assault rifle magazine into your enemies without missing

-Survivor
Get a knife kill when all of your ammo is empty

-(Lights Out)
Finish an enemy off by hitting them with a flashbang. (Direct Impact)

-(Dark Bringer)
Prevent 25 Tactical Insertions

-(Perfectionist)
Fire an entire Sniper magazine into your enemies without missing

-(Silence)
Kill someone with a throwing knife while flashed or stunned

-Tactical Deletion
Kill 25 players that spawn using Tactical Insertion

-(Rejected)
Destroy 5 enemy equipment

-(Kleptomaniac)
Kill 3 different people with 3 different weapons in one life

-(<3)
Kill Yourself and 1 enemy by cooking a granade without throwing it

-(Toxic)
Get killed by an enemy M.O.A.B

-(Living Dead)
Survive Final Stand

-(Infected)
Get killed by a melee by someone using Infected as their call title

-(UAV Rays)
counter the enemy's UAV 3 times in a single match

-(Martyr)
Get 1 kill with a Martyrdom deathstreak

-(Enemy with Benefits)
Kill multiple enemies with a Semtex stuck to one of them

-(Friends with Benefits)
Kill an enemy by sticking a Semtex to a friend

-(Skeet Shooter)
Kill an enemy that is in mid-air

-(How The?)
Kill an enemy using bullet penetration to shoot explosive device through the wall

-(Bow Down)
Kill 15 enemies while you are crouching

-Pushin Daisies
Fall 30 feet or more to your death

-(Boilermaker)
Kill 5 enemies by destroying cars

-(Think Fast)
Finish an enemy off by hitting them with a frag grenade. (Direct Impact)

-(Noob Tuber)
Kill an enemy with a rifle-mounted grenade launcher without detonation (Direct impact)

-(Smoke Grenade)
Kill 25 enemies inside your Smoke screen or throw_back

-(Scrambler)
Kill 25 enemies within the proximity of your Scrambler

-(Portable Radar)
Kill 25 enemies within the proximity of your Portable Radar

-Highlander
Play an entire full-length match without dying

-(Backstabber)
Stab an enemy in the back with your knife

-(Take a Stab)
Kill 15 players with a Throwing Knife

-Behind Enemy Lines
Get a 10 killstreak with 0 killstreaks selected

-The Specialist
Earn the All Perks Bonus 8 times

-Crackin Skulls
Kill 25 enemies with a headshot while using an assault rifle

-(Flashbang)
Flash 25 enemies

-(Concussion)
Stun 25 enemies

-(EMP Grenade)
EMP 25 enemies

-(Pineapple Express)
Kill 25 enemies with grenades

-(BAM!)
Kill 10 enemies with cooked grenades

-(Bouncer)
Kill 15 enemies with Bouncing Betties

-(No Boom)
Stop 25 enemy projectiles with the Trophy System

-Kill 2 or more enemies with a single C4 pack, 25 times

-(Hardcore Only)
Win 5 Hardcore Team Deathmatch game(s)

-(Ambush!)
Kill 2 or more enemies with a claymore

-(The Feared)
Place first, second or third in 5 Free-for-all matches

-(Ghillie in the Mist)
Get 100 one-shot kills with sniper rifles

-(Low Profile)
Kill 15 enemies while you are prone

-(BOOM! Headshot)
Kill 25 enemies with a headshot while using a Light Machine Gun

-(C4 and After)
Kill 15 Enemies With C4

-(Intergalactic)
Win 20 sabotage games

-(Pop Off)
Kill 25 enemies with headshots while using a submachine gun

-(Pin Puller)
Kill 2 or more enemies with a single frag granade, 25 times

-(Ta-Da!)
Kill an enemy within 5 seconds of tactically inserting,25 times

-(Joint Ops)
Get 15 assists

-(Unbreakable)
Deflect 100 explosions with your Riot Shield

-(Protect and Serve)
Absorb 50000 damage with your Riot Shield

-(Bullet proof)
Deflect 50000 bullets with Riot Shield

-Unstoppable
Reach wave 15 in all Special Ops Survival maps

-Over Achiever
Earn 3 stars in all Special Ops missions

-Get 1000 kills with a Sentry Gun

-Get 1000 kills with a Predator Missle

-Kill 1000 enemies with a Percision Airstrike

-Kill 1000 enemies with an Attack Helicopter

-Kill 1000 enemies with a Pavelow

-Kill 1000 enemies with a Stealth Bomber

-Kill 1000 enemies with an AC130

-(Blademaster)
Knife 250 enemies

-(The Stand)
Kill 100 enemies while in Final Stand

-(The Silent)
Kill 1000 enemies while using a silenced weapon

-(Sleight of Hand Pro)
Get 300 kills using Sleight of Hand

-(Assassin Pro)
Get 50 kills while enemy UAV is up and using Assassin

-(Quickdraw Pro)
Get 200 kills within a few seconds of aiming down your sights while using Quickdraw

-(Dead Silence pro)
Get 125 close range kills using Dead Silence

-(Stalker Pro)
Get 300 kills while aiming down sights and using stalker

-(Scavenger Pro)
Resupply 250 times using Scavenger

-(Blind Eye Pro)
Destroy 100 enemy killstreak rewards using Blind Eye

-(Overkill Pro)
Get 300 kills with your second primary weapon

-(Blastshield Pro)
Survive 50 explosions while using blastshield

-(SitRep Pro)
Destroy 125 enemy devices while using SitRep

-(Marksman Pro)
Get 125 kills while holding breath and using Marksman

-(Steady Aim Pro)
Get 300 hipfire kills using Steady Aim

-(Hardline Pro)
Get 200 killstreaks while using Hardline

-(Kick)
Use Kick Proficiency to kill 300 enemies while aiming down sights

-(Attachments)
Use Attachments Proficiency to kill 300 enemies whiles using a weapon with two attachments

-(Stability)
Use Stability Proficiency to kill 300 enemies while aiming down sights

-(Range)
Use Range Proficiency to kill 300 enemies while using a weapon with two attachments

-(Impact)
Kill 300 enemies through a surface using the impact Proficiency

-(Focus)
Use Focus Proficiency to kill 300 enemies that just shot you

-(Breath)
Use Breath Proficiency to kill 300 enemies while aiming down sights

-(Melee)
Use Melee Proficiency to kill 300 enemies with melee

-(Speed)
Kill 300 enemies while using the Speed Proficiency

-(Damage)
Use Damage Proficiency to kill 300 enemies

-(UAV Expert)
Call in 150 Support UAVs

-(UAV Expert)
Call in 150 Assault UAVs UAVs

-(Counter UAV Expert)
Call in 150 Counter-UAVs

-(Vest Expert)
Call in 150 Ballistic Vests

-(Airdrop Trap Expert)
Call in 150 Airdrop Traps

-(Stealth Airstrike Expert)
Call in 40 Stealth Bombers

-(EMP Expert)
Call in 40 EMP's

-(Escort Airdrop Expert)
Call in 40 Escort Airdrops

-(Advanced UAV Expert)
Call in 150 Advanced UAV

-(Sam Expert)
Call in 150 Sam Turrents

-(Care Package Expert)
Call in 150 Care Packages

-(Preator Missisle Expert)
Call in 150 Presdator Missiles

-(Sentry Expert)
Call in 150 Sentry Guns

-(I.M.S Expert)
Call in 150 IMS

-(Airstrike Expert)
Call in 150 Airstrikes

-(Helicopter Expert)
Call in 150 Attack Helicopters

-(Strafe Run Expert)
Call in 40 Strafe Runs

-(AH-6 Expert)
Call in 40 AH-6 Overwatches

-(AGM Expert)
Call in 40 Reapers

-(Assault Drone Expert)
Call in 40 Assault Drones

-(Pave Low Expert)
Call in 40 Pave Lows

-(AC130 Expert)
Call in 40 AC-130s

-(Juggernaut Expert)
Call in 40 Juggernauts

-(Osprey Gunner Expert)
Call in 40 Osprey Gunners

-(Juggernaut Expert)
Call in 40 Juggernaut Recons

-(Remote Sentry Expert)
Call in 150 Remote Sentry Guns

-(Recon Drones Expert)
Call in 150 Recon Drones

-(Escort Airdrop Expert)
Call in 40 Escort Airdrops


(Specialist)


-(Sprint Specialist)
Earn Extreme Conditiong 150 times

-(Reload Specialist)
Earn Sleight of Hand 150 times

-(Scavenger Specialist)
Earn Scavenger 150 times

-(Blind Eye Specialist)
Earn Blind Eye 150 times

-(Recon Specialist)
Earn Recon 150 time

-(Hardline Specialist)
Earn Hardline 150 times

-(Assassin Specialist)
Earn Assassin 150 times

-(Quickdraw Specialist)
Earn Quickdraw 150 times

-(Blast Shield Specialist)
Earn Blast Shield 150 times

-(SitRep Specialist)
Earn SitRep 150 times

-(Marksman Specialist)
Earn Marksman 150 times

-(Steady Aim Specialist)
Earn Steady aim 150 times

-(Silence Specialist)
Earn Dead Silence 150 times

-(Stalker Specialist)
Earn Stalker 150 times

Source: http://callofduty-8-modernwarfare-3.com/list-of-modern-warfare-3-titles-and-how-to-get-them/