Pit 100 robots in Rottenburg.

Kill a tank before it crashes through the barrier in Rottenburg.

Max out all resistances on a single class.

Max out all primary weapon upgrades.

Use one ÜberCharge to quickly revive 2 teammates within 5 seconds.

As a Medic, share your canteen 5 times in a single wave.

Block 5,000 damage with the shield as a Medic in a single life.

Prevent the bomb from ever reaching an alarm zone during the final wave of an advanced difficulty mission.

Pick up a credit pile that is about to expire.

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

Complete a mission with 5 people on your Friends List.

As a Pyro, reset the bomb 3 times in a single wave.

Kill 5 robots with a single rocket while upgraded with rocket specialist.

Stun 50 robots while upgraded with rocket specialist.

As a Scout, use the Sandman to mark 15 robots for death in a single wave.

Kill 5 robots in a single explosion from detonating a sentry buster.

As a Sniper collect $500 in a mission without running over the currency packs.

As a Sniper, kill 4 robots simultaneously.

Buff 4 or more teammates as a Soldier at the same time in a single wave.

As a Spy, sap 10 robots at once.

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

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.

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

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