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