1 Shot 1 Kill

List from A-Z
101 accolades found/out of 108

6th Sense: No deaths form behind
7.62mm: Most LMG kills

AFK: No kills/No deaths
Accident Prone: Most suicides
Air Ops: Most helicopters
Alpha Male: Most kills on a lower rank
Ambusher: Most claymore kills
AR Expert: Most Assault Rifle headshots
AR Specialist: Most assault rifle kills
Arsenal: Most weapons used
Avenger: Most avenger kills

Blinder: Most flashbang kills
Blindfire: Most bullet penetration kills
Blindsided: Most deaths from behind
Bomb Blocker: Most bomb carrier kills
Bomb Expert: Most bombs planted
Bomb Runner: Most bombs carried
Bomb Threat: Most kills as bomb carrier
Boomstick: Most shotgun headshots
Buckshot: Most shotgun kills
Butcher: Most throwing knife kills

Clutch Player: Match Winning Kill
Concussive Barrage: Unspecified at this time
CQB: Most SMG kills

Dead Aim: Most sniper headshots
Deathrow: Longest deathstreak
Decimator: Killed entire enemy team without dying
Defuser: Most bombs defused
Destroyer: Most targets destroyed
Devastation: Highest multikill
Dominator: Most points captured
Double Threat: Most kills as flag carrier

Evolver: Most classes changed
Explosives: Unspecified at this time
Executioner: Most execution kills
Exterminator: Most thumper kills

Flag Blocker: Most flag carrier kills
Flag Capturer: Most flags captured
Flag Returner: Most flags returned
Flag Runner: Most flags carried
Flanker: Most kills from behind
Fragger: Most frag grenade kills

Genocidal: Most multikills
Grassy Knoll: Most time spent prone
Grenadier: Most grenade kills
Grudge Match: Most kills of same player

Hairtrigger: Most ADS kills
Hard Boiled: Most pistol kills
High Command: Highest average altitude
Hijacker: Most kills stolen
HQ Defender: Unspecified at this time
Hot Potato: Most grenades thrown back
Immortal: Highest kill/death ratio

Juggernaut: Fewest deaths

Lights Out: Most tactical insertions prevented
Lifer: Longest average life
LMG Expert: Most LMG headshots
Loaner: Most kills with enemy weapons
Lockdown: Most time spent in one place
Lock and Load: Most reloads
Low Profile: Lowest average altitude

Marksman: Most longshots
Magnifier: Most scoped kills
MVP: Most kills/Fewest deaths

Nearsighted: Most friendlies shot
Nomad: Longest distance traveled
None Spared: Killed entire enemy team

Overkill: Most kills/Most headshots

Pathfinder: Most UAV's
Protester: Most deaths by riot shield

Rally: Most comebacks
Rescuer: Most rescues
Runner: Most time spent running

Sidekick: Most assists
Semtex Pro: Most semtex kills
Sharpshooter: Most headshots
Shellshocked: Most explosions survived
SMG Expert: Most SMG kills
Smoking Gun: Most pistol headshots
Sneaker: Most time spent crouched
Sniper: Most sniper kills
Spy Game: Most time watching killcams
Sprayer: Most hipfire kills
Starter: Most killcams skipped
Statuesque: most stationary kills
Steamroller: Most kills/Longest killstreak
Stunner: Most stun grenade hits
Survivalist: Most equipment kills
Supernatural: Kill/death ratio over 10
Switchblade: Most knife kills

The Feared: Most kills
The Show: 10 kills/No deaths
Terminal: Shortest life
Top Gun: Most airstrikes
Trigger Happy: Most shots fired

Unbreakable: Most bullets deflected
Undercover: Most time spent near enemies
Unstoppable: Longest killstreak
Upriser: Most kills of higher rank

Vengeful: Most paybacks

Weapon Rack: Most weapon swaps

What does it mean by most? Like once you enter a game, if you have the most weapon swaps, you can use the sign during that game, or that it's unlocked for you?

It's unlocked for you.

updated.