The '#' refers to the page, column and row as they appear in the game (i.e. 1-1-1 = page 1 column 1 row 1)

1-1-1 Unstoppable - Longest killstreak
1-1-2 Sharpshooter - Most headshots
1-1-3 Wingman - Most assists
1-1-4 Devastation - Highest multikill
1-2-1 The Feared - Most kills
1-2-2 MVP - Most kills/Fewest deaths
1-2-3 Overkill - Most kills/Most headshots
1-2-4 Grim Reaper - Most kills/Longest killstreak
1-3-1 Immortal - Highest kill/death ratio
1-3-2 Steamroller - Most damage dealt
1-3-3 Juggernaut - Fewest deaths
1-3-4 Blindfire - Most bullet penetration kills
1-4-1 Vengeful - Most payback
1-4-2 Avenger - Most avenger kills
1-4-3 Rescuer - Most rescues
1-4-4 Marksman - Most longshots
1-5-1 Upriser - Most kills of higher rank
1-5-2 Revenge - Most final stand kills
1-5-3 Executioner - Most execution kills
1-5-4 Genocidal - Most multikills
1-6-1 Rally - Most comebacks
1-6-2 Lifer - Longest life
1-6-3 Statuesque - Most stationary kills
1-6-4 Lights Out - Most tactical insertions prevented
1-7-1 Shell Shocked - Most explosions survived
1-7-2 Blinder - Most flashbang hits
1-7-3 Stunner - Most stun grenade hits
1-7-4 Switchblade - Most knife kills
1-8-1 Hard Boiled - Most pistol kills
1-8-2 Grenadier - Most grenade kills
1-8-3 Fragger - Most frag grenade kills
1-8-4 C4 Killer - Most C4 kills
1-9-1 Semtex Pro - Most semtex kills
1-9-2 Ambusher - Most claymore kills
1-9-3 Butcher - Most throwing knife kills
1-9-4 CQB - Most SMG kills

2-1-1 AR Specialist - Most assault rifle kills
2-1-2 Explosivo - Most rocket kills
2-1-3 Buckshot - Most shotgun kills
2-1-4 7.62mm - Most LMG Kills
2-2-1 Sniper - Most sniper kills
2-2-2 Smoking Gun - Most pistol headshots
2-2-3 SMG Expert - Most SMG headshots
2-2-4 AR Expert - Most assault rifle headshots
2-3-1 Boomstick - Most shotgun headshots
2-3-2 LMG Expert - Most LMG headshots
2-3-3 Dead Aim - Most sniper headshots
2-3-4 Survivalist - Most equipment kills
2-4-1 Magnifier - Most scoped kills
2-4-2 White Hot - Most thermal kills
2-4-3 Crowd Control - Most riot shield kills
2-4-4 Heavy Earner - Most weapon XP earned
2-5-1 Hairtrigger - Most ADS kills
2-5-2 Sprayer - Most hipfire kills
2-5-3 Alpha Male - Most kills of a lower rank
2-5-4 Loaner - Most kills with enemy weapons
2-6-1 Spy Game - Most time watching killcams
2-6-2 Lock & Load - Most reloads
2-6-3 Weapon Rack - Most weapon swaps
2-6-4 Trigger Happy - Most shots fired
2-7-1 Lockdown - Most time spent in one place
2-7-2 High Command - Highest average altitude
2-7-3 Low Profile - Lowest average altitude
2-7-4 Nearsighted - Most friendlies shot (Not Confirmed)
2-8-1 Grudge Match - Most kills of same player
2-8-2 Arsenal - Most weapons used
2-8-3 Undercover - Most time near enemies
2-8-4 Evolver - Most classes changed
2-9-1 Starter - Most killcams skipped
2-9-2 Accident Prone - Most suicides
2-9-3 Blindsided - Most deaths from behind
2-9-4 Clay Pigeon - Most death from shotgun

3-1-1 Terminal - Shortest life
3-1-2 Deathrow - Longest deathstreak
3-1-3 Hijacker - Most stolen kills
3-1-4 Protester - Most deaths by riot shield
3-2-1 Bomb Expert - Most bombs planted
3-2-2 Defuser - Most bombs defused
3-2-3 Destroyer - Most targets destroyed
3-2-4 Bomb Blocker - Most bomb carrier kills
3-3-1 Bomb Threat - Most Kills as bomb carrier
3-3-2 Bomb Runner - Most bombs carried
3-3-3 Pathfinder - Most UAVs
3-3-4 Top Gun - Most airstrikes
3-4-1 Air Ops - Most helicopter
3-4-2 Hired Gun - Most assault killstreaks used
3-4-3 Team Player - Most support killstreaks used
3-4-4 Nomad - Longest distance traveled
3-5-1 Runner - Most time spent sprinting
3-5-2 Sneaker - Most time spent crouched
3-5-3 Grassy Knoll - Most time spent prone
3-5-4 Soloist - Most specialist killstreaks earned
3-6-1 Survivor - Least damage taken
3-6-2 No Fear - Longest time holding the flag
3-6-3 Unbreakable - Most bullets deflected
3-6-4 Flanker - Most kills from behind
3-7-1 Hot Potato - Most grenades thrown back
3-7-2 Dominator - Most points captured
3-7-3 HQ Capturer - Most HQs captured
3-7-4 HQ Destroyer - Most HQs destroyed
3-8-1 Flag Capturer - Most flags captured
3-8-2 Flag Returner - Most flags returned
3-8-3 Flag Runner - Most flags carried
3-8-4 Flag Blocker - Most flag carrier kills
3-9-1 Double Threat - Most kills as flag carrier
3-9-2 Confirmation - Most kills Confirmed
3-9-3 Denier - Most Kills Denied

Source: http://callofduty.wikia.com/wiki/Call_of_Duty:_Modern_Warfare_3_Accolades