TF2 "Second Opinion" medic achievement

As promised, Valve has released a whole slew of info on the upcoming content package, including

Goldrush SS's, an interview with Robin Walker and the complete list of Medic Acheivements.

The complete list of new Medic-specific achievements follows: (36 in total)

First Do No Harm: Play a full round without killing any enemies and score the highest on a team of 6 or more players.
Quadruple Bypass: Heal a teammate who's taking fire from 4 enemies at once.
Group Health: Work with 2 other medics to deploy 3 simultaneous uber-charges.
Surgical Prep: Have an uber-charge ready before the setup phase ends.
Trauma Queen: Deploy 3 uber-charges in less than 5 minutes, and assist in 5 kills during that time.
Double Blind Trial: Deploy an uber-charge within 8 seconds of a nearby enemy medic deploying his.
Play Doctor: In a team with no medics, be first to switch to medic after a teammate calls "Medic!" and then heal 500 health.
Triage: Deploy an uber-charge on a teammate less than a second before they're hit by a critical explosive.
Preventive Medicine: Block the enemy from capturing a control point with an uber-charged teammate.
Consultation: Assist a fellow medic in killing 5 enemies in a single life.
Does It Hurt When I Do This?: Kill 50 scouts with your syringe gun.
Peer Review: Kill 50 medics with your bone saw.
Big Pharma: Assist a heavy in killing 30 enemies where neither of you die.
You'll Feel A Little Prick: Assist in killing 4 enemies with single uber-charge on a scout.
Autoclave: Assist in burning 8 enemies with a single uber-charge on a pyro.
Blast Assist: Assist in exploding 5 enemies with a single uber-charge on a soldier.
Blunt Trauma: Assist in punching out 4 enemies with a single uber-charge on a heavy.
Medical Breakthrough: Assist in destroying 8 enemy engineer buildings with a single uber-charge on a Demoman.
Midwife Crisis: Heal an engineer as he repairs his sentry while it's under enemy fire.
Ubi Concordia, IBI Victoria: Assist in killing 5 enemies on an enemy control point, in a single life.
Grand Rounds: Heal 200 teammates after they've called for "Medic!"
Infernal Medicine: Extinguish 100 burning teammates.
Doctor Assisted Homicide: Assist in killing 20 nemesis.
Placebo Effect: Kill 5 enemies in a single life while having your uber-charge ready, but undeployed.
Sawbones: Hit enemies with your bonesaw 10 times in arrow without dying or missing.
Intern: Accumulate 7000 heal points in a single life.
Specialist: Accumulate 10000 heal points health in a single life.
Chief of Staff: Accumulate 10 million total heal points.
Hypocritical Oath: Kill an enemy spy that you have been healing.
Medical Prevention: Save a falling teammate from dying on impact.
Second Opinion: Uber-Charge 2 teammates at once.
Autopsy Report: Provide an enemy with a freezecam shot of you taunting above their ragdoll.
FYI I Am A Medic: Use your bonesaw to kill 5 enemy spies who have been calling for "Medic!"
Family Practice: Uber-charge ten of your steam community friends.
House Call: Join a game that one of your friends is in and then deploy and uber-charge on him.
Bedside Manner: Be healing a teammate as he achieves an achievement of his own.

Well, the wait is finally over. As reported by Shacknews.com tonight at 12:26am, Valve has released info regarding the upcoming medic unlockable weapons, slated to be released the week of April 20th. Further info regarding the rest of this massive upload package, which will include the new Valve-designed escort map "Goldrush", will be released in the next couple days as well as an i'view between Shacknews & Valve's TF2 guy, Robin Walker. Full details of the new Medic weapons are below..

The Blutsaugher
For players that earn one third of the 36 new medic achievements, they will be given a new syringe gun. Called "The Blutsaugher," this new weapon no longer has the ability to score critical hits against an opponent. Instead it will draw health from enemies each time a syringe hits. Especially useful as a weapon to retreat away from the fight while staying alive.

The Critzcrieg
Once a medic has earned two thirds of the achievements, they will be granted "The Critzcrieg." This new medigun uses its ubercharge not for invulnerability, but to give its recipient 100% chance to fire critical ordinance. Medics and the player they are charging need to be careful though, because as much fun as it is to fire critical rockets as fast as you can, the other team will see what you're up to and try to put a quick stop to your plan.

The Ubersaw
For the determined medic that has earned all 36 of the new achievements, they will find themselves the proud owner of "The Ubersaw," which will take damage done in melee attacks and convert it directly to ubercharge. Four hits with this new weapon will fully charge whatever medigun the medic has equpped.

First, the achievements that Shawana haslisted have been changed slightly.  What I want to know is how do you actually uber two teammates at once for the second opinion?

You need to rapidly click between two players while using the ubercharge.  Autohealing must be turned off for this to work.  Thanks to Agulf.