Kill 79 enemies who have Balloonicorn pets.

Have 2 BEST FRIENDS at the same time.

Have 6 teammates using Pyrovision at the same time.

Dominate a player using the Pyrovision Goggles and earn your own pair!

Ignite 3 enemy players using your Rainblower taunt.

Earn all credit bonuses in an advanced difficulty mission.

Pick up a credit pile that is about to expire.

Collect 1,000,000 credits in your career.

Complete a mission with 5 people on your Friends List.

Play an entire mission as a single class, and do this for every class.

Destroy two tanks within 5 seconds of each other.

Destroy the tank during the final seconds of the bomb being deployed.

Destroy a tank within 20 seconds of its arrival.

During a wave, defend the hatch 10 times from robots about to deliver a bomb.

In a single wave, kill 15 bomb-carrying robots in a row before they level up.

Defeat a wave in an advanced difficulty mission without dying once.

Complete the Crash Course, Doe's Drill, and Mann-euvers missions.

Use a canteen charged with 'Teleport to Spawn' and then kill the bomb carrier within 5 seconds.

Use a canteen charged with 'Crit Boost' to destroy a giant robot.

Use a canteen charged with 'ÜberCharge' to destroy 15 robots.

During a wave, use a canteen charged with 'Instant Building Upgrade' to build a new sentry gun within 3 seconds of your previous sentry gun's destruction.

During a wave, use a canteen charged with 'Ammo Reload' to refill an empty weapon slot.

Max out all primary weapon upgrades.

Max out all resistances on a single class.