For those who havent seen a likn below will take you to a picture of the new achievments on tf2portal.de . Ive seen somewhere a description of what you have to do and ill edit this post with the descriptions once i find them.

http://www.tfportal.de/gallery.php?pack=tf2&file=tf2_medic_achievements.jpg&current=0

*EDIT*
Here we go the german translations are bad though sorry. Also taken from tf2portal.de
Assist Capturer - When Capture help
Top Score Board - At the end of the first lap in the highscore list
Syringe Scoot - Scouts with the needle gun kill
Switch to Medic - The class "Medic" switch
Simul Charge - Several simultaneously recharge (simultaneously)
Setup Charge - During the setup charge
Save Mate team - Team Mate save (?)
Falling team mate - Team Mate safe before death fall from a parapet / cliff / etc. Healing through salvage
Rapide Charge - Quick Charge
Wile Charged kill - kill someone while you charged
Healed Kill Spy - A healed kill Spy
Invite Join Charge - Somebody call mitzuheilen
Heal Under Fire - while you heal burns
Heal Large - Much cure (how much?)
Huge Heal - Most heal much (how much?)
Heal Grind - even longer to heal vieeeeeel (how much?)
Heal Ingé - Engineer heal
Heal Callers - the call to heal
Heal Achiever - (?)
Freeze Cam Ragdoll --
Extinguish team mate - Team Mate delete (how?)
Medic Counter Charge - (?)
Charge Juggle - more than one team comrades About give gleichzeititg
Charge Friends - someone from the Friends List heal
Charge blocker --
Bonesaw Spy caller - An enemy spy, according to a Medic calls, with the bone saw kill
Bonesaw Nomisses - an enemy without Fehltreffer dismember
Bonesaw Medic - A gegenerischn Medic dismember
Assist vs. Nemesis - In a kill against a hostile help Nemesis
Assist Soldier - A Soldier with a Kill help
Assist Scout - A scout for a Kill help
Assist Pyro - A Pyro help for a Kill
Assist Medic - A Medic for a Kill help
Assist Heavy Long - A heavy for a long time help
Heavy Assist - A heavy for a Kill help
Assist Demoman - A demonstration at a Kill help

Informative, looks like all the hardcore medic runs will pay off in some neat achievments, also the achievments are good to teach the new medicplayers to be an aware player

I've read you have to heal 10000000 points (ten million=3 months of intense healing) in an interview with Robin Walker in PC Gamer

Oh wow that is hardcore

Just wait for the servers full of 8 medics aside lined up taking it in turns to bonesaw and heal to grind it

some of them are really hard, like 'kill healed spy'...
I never healed a spy (maybe once ) let alone killed him afterwarths...

Or 'heal achiever'
not much skill in that, just luck.

Extinguish team mate. Doesn't that mean you have to heal a team mate that is burning?

Maybe one of the new unlocks is a fire blanket?

or a fire hose

anyway, we will have to wait a bit more, since the "overhealer" has been dumped Theres a thread about this somewhere...

Any theories about the last medic unlock? Its supposed to completely change the way the class is played... But its still a medic, so hes got to heal people. My theory: some kind of aura, people automatically get healed when staying close to the medic, or maybe a sprinkler hose spreading the healing juice among the teammates...

A heal ray that gives the enemy a dissadvantage (when used on an enemy) and heal teammates (maybe a bit slower than normal)
You could slow the enemy down and when you're 'bar' is filled you can freeze one or two for 5 seconds. It would make the medic a little bit less supporting.

Maybe the thing we need is the needle and thread!
sow body parts of dead enemies on to your team mates.
-> A heavy with an extra pyro arm (adds a flametrower) and two extra leggs (much faster)

The last unlocks were a new needles gun and bonesaw, nothing else was stated though and my guess is it damages uber people as one of the achivmens is charge blocker, but that would mean you get it after getting half the achivments and the over healer would be all the achivments.

10 million healing is extremely doubtfull to say in a good round i get 20000 at most, hell ive got 160 hours as medic but probaly havent healed that much