The Pyro Update Title update for Team Fortress 2 has 38 achievements.
Kill 50 Heavies with your flamethrower.
Kill 3 enemies while they're taunting.
Kill 1000 enemies.
Ignite a rocket-jumping Soldier while he's in midair.
Ignite 100 enemies with the flare gun.
Kill 3 enemies in a single ÜberCharge.
Ignite 50 enemies capturing one of your control points.
Kill a Soldier with a reflected critical rocket.
Use your shotgun to finish off 20 players you've ignited.
Have 2 enemy Scouts on fire at the same time.
Kill 15 players while you're dead.
Ignite 5 Spies who have a sapper on a friendly building.
Ignite 5 enemies carrying your intelligence.
Ignite 10 cloaked Spies.
Ignite 10 enemies that have recently used a teleporter.
Kill 3 enemies in a row, all within the same area.
Kill 3 people with your axe in one life.
Kill 6 people with your axe in one life.
Ignite 10 disguised Spies.
Ignite 10 Snipers while they are zoomed in.
Ignite 3 Medics that are ready to deploy an ÜberCharge.
Destroy 50 Engineer buildings.
Kill 500 enemies.
Kill an enemy with a taunt.
Cause a dominated player to leave the server.
Ignite an enemy, and the Medic healing him.
Kill 50 enemies with your flamethrower, from behind.
Kill a burning enemy who was ignited by another Pyro.
Reflect 100 projectiles with your compressed air blast.
Kill an enemy in the same second that he kills you.
Achieve 10 of the achievements in the Pyro pack.
Achieve 16 of the achievements in the Pyro pack.
Achieve 22 of the achievements in the Pyro pack.
Force 10 burning enemies to jump into water.
Kill 10 enemies while you're both underwater.
Do 1 million points of total fire damage.
Ignite an enemy Spy while he's flicking a cigarette.
Provide enemies with freezecam shots of each of your taunts.