Complete the indicated task to unlock the corresponding reward and amount of experience points.

Assist (150): Damage an enemy, a teammate then kills.
Heal Teammate (325): Restore at least half of a teammate's health.
Pack Hunter (550): Be near a teammate when they kill an enemy.
Rescue Kill (700): Kill an enemy near a teammate that has been knocked down.
Synchronized Kill (900): Kill an enemy at the same time a nearby teammate does.
Vendetta (1,200): Kill an enemy who recently killed a teammate.
Crush (1,500): Kill an enemy with building debris.
Beat Down (1,600): Kill an enemy with a melee attack.
Streak Stopper (1,800): Kill an enemy who is unstoppable.
Death from Above (2,150): Kill an enemy by thrusting down.
Remote Save (2,300): Kill an enemy before they can detonate a remote charge stuck to you or a teammate.
Survivor (2,600): Recover to full health after nearly dying.
Unstopable (3,050): Kill 5 or more enemies in a row.
Backwhat? (3,200): Kill an enemy that is wearing a backpack while you are not wearing one.
Knockdown (3,650): Knock down multiple enemies simultaneously with the concussion pack.
Death By Boundary (4,100): Knock an enemy out of the level boundaries.
Stuck (4,400): Detonate a remote charge stuck to an enemy.
Headshot Kill (4,500): Kill an enemy with a headshot.
Who's #1 (5,000): Kill the enemy with the highest number of kills.
Full Control (5,400): Fully repair a target.
Mega Kill (5,800): Kill multiple enemies within 3 seconds.
Back Off (6,600): Kill an enemy who is melee attacking at close range.
Ghost Kill (7,000): Kill a stealthed Enemy.
Bullseye (7,200): Kill an enemy with a direct rocket hit.
Backfire (7,800): Kill an enemy with their own explosive.
You're doing it wrong! (8,250): Kill an enemy with the Reconstructor.
Charge (8,750): Rhino charge through a wall and kill an enemy.
Power Trip (9,500): With Firepower active, kill an enemy with a melee weapon.
Interceptor (10,600): Kill a ragdolling enemy in mid-air.
Hail Mary (10,900): Kill an enemy from far away without using a gun.
Blast (11,500): Kill an enemy with an explosive barrel or tank.
Flagman (12,200): Kill an enemy with their team flag.
Air Strike (13,000): Kill an enemy while in the air.
Shake it Up (14,200): Kill an enemy while your Tremor pack is activated.
Dust Bunny (15,500): Kill an enemy who is in mid-jump.
Good Timing (16,500): Use the Rhino or Thrust pack to survive an attack.
BBQ (17,500): Hit 3 enemies simultaneously with the Arc Welder.
Blindside (18,750): Kill an enemy from behind.
Payback (20,250): Exact revenge within 15 seconds of respawning.
X-Ray (22,500): Kill an enemy through a wall with the Rail Driver.
Sharpshooter (24,000): Shoot and kill an enemy from far away.
Sleeper Kill (27,000): Kill a fallen enemy with a melee attack.
Death from Below (29,000): Kill an enemy by thrusting up.
Rainbow Wars (31,000): Kill an enemy that is using the Heal Pack.
Lined Up (33,000): Hit 2 or more enemies with one Rail Driver shot.
Doppleganger (38,000): Kill an enemy that has the same backpack you do.
Zombie Kill (44,000): Kill an enemy from beyond the grave.
Vertigo (48,000): Kill an enemy above or below you.
Camper (52,000): Kill an enemy while standing still.
No Problem (56,000): Kill an enemy while at full health.