A Cut Above

Kill a gun-wielding Spy with your knife.

Hint: Find an enemy Spy wielding a gun (revolver or Ambassador) and stab him! This will happen casually most times. Maybe you can catch a spy that is Ambassador-sniping.

May I Cut In?

Backstab an enemy and the Medic healing him within 10 seconds of each other.

Hint: Kill the Medic first, and only if he is really healing somebody. And then immediately kill his target. This one may need a little bit of luck, too.

Agent Provocateur

Backstab your Steam Community friends 10 times.

On Her Majesty's Secret Surface

Start capping a capture point within a second of it becoming available.

Hint: You'll have to stand on the next locked control point while your team is capping the current point. Clock and Dagger can help here, too, just stand still on the point and be invisible.

Burn Notice

Survive 30 seconds after being ignited while cloaked.

Hint: After you've been ignited while disguised, find a medpack and wait. It's just about surviving, not burning and surviving.

Point Breaker

Kill 15 enemies who are standing on a control point they own.

Come in From the Cold

Get a Revenge kill with a backstab.

Hint: You're being dominated? Then find the baddy and stab him from behind!

Sap Auteur

Destroy 1000 Engineer buildings with sappers.

Hint: Every teleporter, every sentry gun and every dispenser counts.

Constructus Interruptus

Kill an Engineer who is working on a sentry.

Sapsucker

Sap an enemy building, then backstab the Engineer who built it within 5 seconds.

Hint: You'll need to be fast and have a good timing. First find a sentry and its Engi. You put a sapper onto his sentry and when he turns around to fix it, you stab him.

Counter Espionage

Backstab a disguised Spy.

Hint: The spy will raise his knife when he is behind an enemy, even if he is cloaked or disguised.

Skullpluggery

Headshot 20 Snipers with the Ambassador.

Hint: You'll have to kill them with a shot to the head. The Ambassador does critical hits on headshot.

Deep Undercover

While using the Cloak and Dagger, kill the same enemy 3 times, all within the same area in a single life.

Slash and Burn

Backstab an enemy, who then switches to Pyro before they respawn.

Die Another Way

Kill a Sniper after your backstab breaks his Razorback.

Sleeper Agent

Kill an enemy who triggered your feign death in the last 20 seconds.

Diplomacy

Kill 50 enemies with the Ambassador.

Spies Like Us

While cloaked, bump into an enemy cloaked Spy.

Dr. Nooooo

Backstab a Medic that is ready to deploy an ÜberCharge.

Spymaster

Backstab 1000 enemies.

For Your Eyes Only

Provide an enemy with a freezecam shot of you flicking a cigarette onto their corpse.

The Man from P.U.N.C.T.U.R.E.

Stab an enemy while fencing.

FYI I am a Spy

Backstab a Medic who has healed you in the last 5 seconds.

The Man with the Broken Guns

Backstab an Engineer, then sap 3 of his buildings within 10 seconds.

High Value Target

Backstab an enemy who is dominating 3 or more of your teammates.

The Melbourne Supremacy

Dominate a Sniper.

Identity Theft

Backstab the enemy that you're currently disguised as.

Triplecrossed

Backstab 3 Snipers in a single life.

Insurance Fraud

Kill an enemy while you're being healed by an enemy Medic.

Wetwork

Stab an enemy to death while under the influence of Jarate.

Is It Safe?

Backstab 50 enemies who are capturing control points.

Who’s Your Daddy?

Headshot 3 Scouts with the Ambassador.

Joint Operation

Sap an enemy sentry within 3 seconds of a teammate sapping another.

You Only Shiv Thrice

Backstab 3 enemies within 10 seconds.