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

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