These achievements can only be earned in the game mode "Mann vs. Machine."
| Unlockable: | How to unlock: |
| .executioner | In a single wave, kill 15 bomb-carrying robots in a row before they level up. |
| Balls-E | Destroy the tank during the final seconds of the bomb being deployed. |
| Brotherhood of Steel | Complete a mission with 5 people on your Friends List. |
| Clockwork Carnage | Destroy two tanks within 5 seconds of each other. |
| Clockwork Conqueror | Destroy a tank within 20 seconds of its arrival. |
| Control + Assault + Delete | Destroy a sentry buster before it reaches its target. |
| Deus Ex Machina | Defeat a wave in an advanced difficulty mission without dying once. |
| Do Androids Dream? | As a Scout, use the Sandman to mark 15 robots for death in a single wave. |
| Engine Block | Prevent the bomb from ever reaching an alarm zone during the final wave of an advanced difficulty mission. |
| Fast Cache | Pick up a credit pile that is about to expire. |
| Frags to Riches | Earn all credit bonuses in an advanced difficulty mission. |
| German Engineering | Use a canteen charged with 'UberCharge' to destroy 15 robots. |
| Ghost in the Machine | Use a canteen charged with 'Teleport to Spawn' and then kill the bomb carrier within 5 seconds. |
| Hack of All Trades | Play an entire mission as a single class, and do this for every class. |
| Hard Reset | As a Pyro, reset the bomb 3 times in a single wave. |
| Heavy Mettle | During a wave, use rage as a Heavy to push a robot about to deliver the bomb. |
| Kritical Terror | Use a canteen charged with 'Crit Boost' to destroy a giant robot. |
| Maximum Performance | Max out all resistances on a single class. |
| Metal Massacre | Destroy 1,000,000 robots. |
| Negative Charge | Kill 5 Medics that are ready to deploy an UberCharge in a wave. |
| Raid Array | Complete the Crash Course, Doe's Drill, and Manouvers missions. |
| Real Steal | As an Engineer, escape with your sentry as a sentry buster is about to detonate. |
| Shell Extension | During a wave, use a canteen charged with 'Ammo Reload' to refill an empty weapon slot. |
| Silicon Slaughter | Destroy 100,000 robots. |
| Sly Voltage | As a Spy, sap 10 robots at once. |
| Spam Blocker | During a wave, defend the hatch 10 times from robots about to deliver a bomb. |
| Spark Plugger | As a Sniper, kill 4 enemies simultaneously. |
| Steel Fragnolias | Complete all waves successfully in a mission. |
| System Upgrade | Max out all primary weapon upgrades. |
| T-1000000 | Collect 1,000,000 credits in your career. |
| Tech Wrecker | As a Demoman, kill 10 robots in a single detonation. |
| Turbocharger | Buff 4 or more teammates as a Soldier at the same time in a single wave. |
| Undelete | 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 destruct |
| Vial Sharing | As a Medic, share your canteen 5 times in a single wave. |
| Wage Against the Machine | Earn a credit bonus at the end of a wave. |
.