Kill 3 enemies with revenge crits without dying.

Kill a spy and two sappers within 10 seconds.

Kill a disguised spy with your Wrench.

Upgrade 50 buildings built by other team members.

Destroy 25 sappers on buildings built by other team members.

Repair a sentry gun under fire while being healed by a Medic.

Rack up 5000 kills with your sentry guns.

Have your sentry kill the enemy that just killed you within 10 seconds.

Provide an enemy player with a freezecam of your guitar playing skills.

Provide an enemy player with a freezecam of you and the sentry that just killed them.

Use your shotgun to finish off an enemy recently damaged by your sentry gun.

Have a dispenser heal 3 teammates at the same time.

Use a sentry gun to kill 25 enemy players that are capturing a point.

Kill 20 players carrying the intelligence.

Pick up 10,000 waste metal from pieces of destroyed buildings.

Help a teammate construct a building.

Manage to get to and then remove a sapper placed on your building while you were several meters away.

Destroy 50 enemy stickybombs lying in range of friendly buildings.

Smash an enemy player's head in with your guitar.

Kill 10 Snipers with a sentry gun under control of your Wrangler.

Perform 50 repairs and/or reloads on a Sentry gun being Wrangled by another Engineer.

Destroy an enemy Engineer's sentry gun with a sentry under control of your Wrangler.

Haul a level 3 sentry gun into a position where it achieves a kill shortly after being redeployed.

Haul buildings 1 km over your career.