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