Expeirience gained for various things:
Code:
Above and Beyond - +200 Capture a point while in Second Chance.
Afterlife - +100 Killed an enemy while dead.
Anti-Bomber - +100 Killed an enemy that was defusing.
Assist - +10-80 (10-90 with Nova Gas) Injure an enemy and your teammate kills him. - Points vary depending on how much the player damages the opponent, similar to the assists in World at War.
Assisted Suicide - +100 Injured an enemy that killed themselves.
Avenger - +50 Killed an enemy who recently killed a teammate.
Backstabber - +50 Knife an enemy player in the back.
Bankrupt - +10 Kill an enemy with the Tomahawk in Sticks and Stones
Bank Shot - +100 Killed an enemy with a banked Tomahawk. - The Tomahawk must bounce off another surface before striking the enemy.
Bomber - +100 Detonated the bomb.
Buzz Kill - +100 Stopped an enemy short of a killstreak.
Comeback - +100 Recovered from a death streak.
Defense - +100 Killed an enemy near the defense point.
Double Kill - +50 Killed 2 people in rapid succession.
Execution - +50 Kill a downed enemy with a headshot.
First Blood - +100 Got the first kill.
Flag Capture - +250 Captured the enemy flag.
Flag Return - +100 Returned the flag.
Flag Runner - +100 Pick up the enemy flag.
Hero - +500 Defused the bomb.
Hijacker - +50 Stole an enemy crate.
Longshot - +50 Killed an enemy from a distance.
Medic - +50 Revive a downed teammate that is using Second Chance Pro.
Multi Kill - +100 Killed more than 3 enemies in rapid succession.
Offense - +100 Killed an enemy near the objective.
Off The Air - +100 Took out a Valkyrie.
One Shot, One Kill - +50 Kill an enemy with one bullet.
Payback - +50 Killed the enemy who killed you.
Position Secure - +150 Took an objective.
Rescuer - +50 Saved a wounded teammate.
Road Rage - +100 Destroyed an RC-XD.
Saboteur - +500 Planted the bomb.
Scalper - +50 Killed an enemy with a Tomahawk.
Share Package - +50 Let a teammate take your Care Package.
Skewer - Shot and killed an enemy with the Ballistic Knife.
Scrapped - Brought down a Helicopter, Spy Plane, or Counter-Spy Plane. (+150 for Spy Plane and Counter-Spy Plane, +400 for Care Package or Attack Helicopter, +500 for Chopper Gunner)
Scrapped Assist - +50 Assisted in taking down air support.
Stuck - +100 Stick an enemy with an explosive.
Triple Kill - +75 Killed 3 people in rapid succession.
Turret Kill - +100 Took out an enemy turret.
Calling in Killstreaks - 3-4 Killstreak - 100 XP
5 Killstreak - 150 XP
6-7 Killstreak - 200 XP
8 Killstreak - 250 XP
9 Killstreak - 300 XP
11 Killstreak - 350 XP
Expeirience required for levels:

Work from there.