Dominate a Sniper.

While cloaked, bump into an enemy cloaked Spy.

Kill a gun-wielding Spy with your knife.

Survive 30 seconds after being ignited while cloaked.

Kill a Sniper after your backstab breaks his Razorback.

Kill an Engineer who is working on a sentry gun.

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

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

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

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

Get a Revenge kill with a backstab.

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

Backstab 3 enemies within 10 seconds.

Backstab 1000 enemies.

Destroy 1000 Engineer buildings with sappers.

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

Backstab a Medic that is ready to deploy an ÜberCharge.

Backstab 50 enemies who are capturing control points.

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

Kill 50 enemies with the Ambassador.

While using the Ambassador, kill 20 Snipers with a headshot.

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

Headshot 3 Scouts with the Ambassador.

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