Bonus XP Events are unlocked as you gain more and more experience, however the name doesn't necessarily tell you what you need to get the event. Here is a full list of all the Bonus XP Events, and what you actually need to do to activate it. You gain 1 extra XP for every Bonus XP Event that you carry out.
The EXP required to unlock the Bonus XP events are written in green. If you fulfil any of the Bonus XP Events before unlocking it, then you will Not get the Bonus XP. In short, you need to unlock it, and then you'll start getting Bonus XP for the event.
| Event (XP Required to Unlock) | Description of Activating Event |
| 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 (1200) | Kill an enemy who recently killed a teammate |
| Crush (1500) | Kill an enemy with building debris |
| Beat Down (1600) | Kill an enemy with a melee attack |
| Streak Stopper (1800) | Kill an enemy who is unstoppable |
| Death from Above (2150) | Kill an enemy by thrusting down |
| Remote Save (2300) | Kill an enemy before they can detonate a remote charge stuck to you or a teammate |
| Survivor (2600) | Recover to full health after nearly dying |
| Unstopable (3050) | Kill 5 or more enemies in a row |
| Backwhat? (3200) | Kill an enemy that is wearing a backpack while you are not wearing one |
| Knockdown (3650) | Knock down multiple enemies simultaneously with the concussion pack |
| Death By Boundary (4100) | Knock an enemy out of the level boundaries |
| Stuck (4400) | Detonate a remote charge stuck to an enemy |
| Headshot Kill (4500) | Kill an enemy with a headshot |
| Who's #1 (5000) | Kill the enemy with the highest number of kills |
| Full Control (5400) | Fully repair a target |
| Mega Kill (5800) | Kill multiple enemies within 3 seconds |
| Back Off (6600) | Kill an enemy who is melee attacking at close range |
| Ghost Kill (7000) | Kill a stealthed Enemy |
| Bullseye (7200) | Kill an enemy with a direct rocket hit |
| Backfire (7800) | Kill an enemy with their own explosive |
| You're doing it wrong! (8250) | Kill an enemy with the Reconstructor |
| Charge (8750) | Rhino charge through a wall and kill an enemy |
| Power Trip (9500) | With Firepower active, kill an enemy with a melee weapon |
| Interceptor (10600) | Kill a ragdolling enemy in mid-air |
| Hail Mary (10900) | Kill an enemy from far away without using a gun |
| Blast (11500) | Kill an enemy with an explosive barrel or tank |
| Flagman (12200) | Kill an enemy with their team flag |
| Air Strike (13000) | Kill an enemy while in the air |
| Shake it Up (14200) | Kill an enemy while your Tremor pack is activated |
| Dust Bunny (15500) | Kill an enemy who is in mid-jump |
| Good Timing (16500) | Use the Rhino or Thrust pack to survive an attack |
| BBQ (17500) | Hit 3 enemies simultaneously with the Arc Welder |
| Blindside (18750) | Kill an enemy from behind |
| Payback (20250) | Exact revenge within 15 seconds of respawning |
| X-Ray (22500) | Kill an enemy through a wall with the Rail Driver |
| Sharpshooter (24000) | Shoot and kill an enemy from far away |
| Sleeper Kill (27000) | Kill a fallen enemy with a melee attack |
| Death from Below (29000) | Kill an enemy by thrusting up |
| Rainbow Wars (31000) | Kill an enemy that is using the Heal Pack |
| Lined Up (33000) | Hit 2 or more enemies with one Rail Driver shot |
| Doppleganger (38000) | Kill an enemy that has the same backpack you do |
| Zombie Kill (44000) | Kill an enemy from beyond the grave |
| Vertigo (48000) | Kill an enemy above or below you |
| Camper (52000) | Kill an enemy while standing still |
| No Problem (56000) | Kill an enemy while at full health |