Sap Auteur

Destroy 1000 Engineer buildings with sappers.

Do not farm this achievement. This is a common theme for the achievements in this part of the guide, but this achievement especially. This is not an achievement that you want to farm purely because it will take so long. 1000 buildings destroyed by sappers? That's ridiculously long! Much like Chief of Staff for the Medic, this is an achievement that you will need to earn through normal play, not by farming. Simply play the Spy and sap lots of enemy builds while preventing them from removing the sapper. Once you rack up 1000 building kills, you will get the achievement.

Note: You can damage the building with your pistol or knife and then sap it, if you wish. However, if you sap a building and it is then destroyed by something else, such as a rocket or gunfire, you will not get the achievement. The kill has to be through the sapper dealing enough damage to destroy it.

Sapsucker

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

A fun achievement, this is one of the most common Spy achievements for all Spies, new and old, to get. The reason for this is that the sapping and backstab combo is one of the most effective in the Spy arsenal. Sap a building, and while the Engineer is busy trying to remove the sapper, backstab him. Achievement got! You have to do this while the Engineer is around, however. The easiest place to do this is near the respawn room in 2fort and the flag room (or final control point) in Well.

To farm this achievement, have a friend play Engineer and build everything. Sentry, dispenser, and both teleporters, preferably all right next to each other. Sap his sentry, then backstab him, then sap the rest of his buildings. The reason for this is that it will net you both Sapsucker as well as The Man with the Broken Guns. It will also help you along towards the massive Sap Auteur achievement. You can also attempt to do both achievements at once in normal gameplay, but don't say we didn't warn you!

Note: You do not have to destroy the buildings with your sapper. You only have to get the sapper placed. You can even let the Engineer remove the sapper and then backstab him, for extra hilarity. We do not recommend doing this for a sentry, however, as you will die. Also, any building works, including dispensers and the two teleporter types (entrance and exit).

Skullpluggery

Headshot 20 Snipers with the Ambassador.

Whoops! Gotta have the Ambassador for this achievement! Once you have it, equip it and simply play as a pseudo-Sniper in the balconies of 2fort. As you can not zoom, you may be at a disadvantage, so you may also consider just cloaking, heading over to the enemy balcony, decloaking, and capping every Sniper there. Since you get headshots just like they do, it'll be easy to clear the balcony, cloak, and escape before their friends show up. Because of the fact that you have to kill 20 Snipers, it is not recommended that you bother farming this achievement. After all, you don't have to get them all consecutively or in the same life! Thank god.

Note: A pun off of the word skullduggery, which is a common word used to describe espionage, especially the kind that involves violence, such as assassinations or sabotage.

Slash and Burn

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

A hilarious achievement that involves an enemy being so upset by your backstabbing that they switch to the Pyro class before respawning specifically to stop you. As is, there is no way you can control what an enemy player will do, so there is no way you can strive for this "normally" besides backstabbing lots of enemies! Farming it is much easier, as your friend can take a backstab, switch to Pyro, and you suddenly have the achievement! There's not many achievements that go well with this one for farming, so pick and choose any achievement with backstabs to work on in tandem. May we suggest Triplecrossed?

Note: Naturally, due to the respawn limit placed upon the achievement, this achievement is almost impossible on instant respawn servers. So don't bother trying to get it there.

Sleeper Agent

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

Naturally, you must have the Dead Ringer in order to get this achievement, so either get it through achievements or random drops. Once you have this device, feel free to use it! This achievement will probably be the first one you get after getting the Dead Ringer, thanks in part to the fact that it is the whole reason the Dead Ringer exists! Simply let yourself be hit, decloak, and backstab the offender. Instant achievement, just for you! The best place to do this is in 2fort on the balcony, as you can get hit by an enemy Sniper's kukri, feign your death, then turn around and backstab them. Also works well on control points!

To farm this achievement, simply have a friend hit you while you have the Dead Ringer equipped. You will feign death and cloak. Immediately decloak and then backstab them. Best farmed alongside backstab achievements such as May I Cut In? or Identity Theft, thanks to the necessity of the backstab after your feign death. You can also go for the intelligence after the backstab, if you wish.

Note: A sleeper agent is one that is designed to infiltrate an organization and lay in wait. Once given the signal, they will then perform one of many different actions, such as assassination or information theft.