This could be a huge post for some people.

Unfortuately, I'm not one of them.
World Traveler
Play a complete game on 2Fort, Dustbowl, Granary, Gravel Pit, Hydro, and Well (CP).
Team Doctor
Accumulate 25000 heal points as a Medic.
Flamethrower
Set five enemies on fire in 30 seconds.
Sentry Gunner
Accumulate 10 sentry gun kills with a single turret.
Nemesis
Get five revenge kills.
Hard to Kill
Get five kills in a row without dying.
Master of Disguise
Trick an opposing medic into healing you.
Dynasty
Win 20 games.
Hardcore
Accumulate 1000 total kills.
Quadruple Bypass
Heal a teammate who's taking fire from 4 enemies at once.
Trauma Queen
Deploy 3 ÜberCharges in less than 5 minutes, and assist in 5 kills during that time.
Double Blind Trial
Deploy an ÜberCharge within 8 seconds of a nearby enemy Medic deploying his.
Play Doctor
In a team with no Medics, be the first person to switch to Medic after a teammate calls for 'Medic!', and then heal 500 health.
Triage
Deploy an ÜberCharge on a teammate less than a second before they're hit by a critical explosive.
Midwife Crisis
Heal an Engineer as he repairs his Sentrygun while it's under enemy fire.
Grand Rounds
Heal 200 teammates after they've called for 'Medic!'.
Powerhouse Offense
Win 2Fort with a shutout.
Lightning Offense
Win Well in 5 minutes or less.
Relentless Offense
Win Hydro without giving up a capture.
Impossible Defense
Successfully defend Gravel Pit without giving up a capture.
Infernal Medicine
Extinguish 100 burning teammates.
Doctor Assisted Homicide
Assist in killing 20 nemeses.
Hypocritical Oath
Kill an enemy Spy that you have been healing.
House Call
Join a game that one of your friends is in and then deploy an ÜberCharge on him.
Bedside Manner
Be healing a teammate as he achieves an achievement of his own.
Milestone 1
Achieve 12 of the achievements in the Medic pack.