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At Valve, we're always striving to make our products better. We've traditionally relied on things like written feedback from players to help decide which improvements to focus on. More recently, Steam has allowed us to collect more information than was previously possible. Episode Two includes a reporting mechanism which tells us details about how people are playing the game. We're sharing the data we collect because we think people will find it interesting, and because we expect to spot emergent problems earlier, and ultimately build better products and experiences as a result. Let us know what you think.


  Achievement name % of players
DRAG AND DROP
Rescue a Survivor from a Smoker's tongue before he takes damage.
74.3%
BRAIN SALAD
Make 100 headshot kills.
70.5%
BLIND LUCK
You or another Survivor take no damage after being vomited on by a Boomer.
69.6%
TONGUE TWISTER
Kill a Smoker who has grabbed you with his tongue.
69.6%
TANKBUSTERS
Kill a Tank without it dealing any damage to a Survivor.
67.1%
OUTBREAK
Catch a rare strain of infection, then pass it on to someone else.
66.7%
PYROTECHNICIAN
Blow up 20 Infected in a single explosion.
66.1%
MY BODYGUARD
Protect any Survivor from an attacking Infected 50 times.
65.1%
HUNTER PUNTER
Shove a Hunter off of a pinned and helpless Survivor.
60.4%
NO SMOKING SECTION
Kill 10 Smokers as they are pulling helpless Survivors.
60%
101 CREMATIONS
Set 101 Infected on fire.
59.1%
TOWERING INFERNO
Light a Tank with a Molotov.
58.5%
HERO CLOSET
Rescue a Survivor trapped in a closet.
57.2%
WITCH HUNTER
Kill a Witch without any Survivor taking damage from her.
53.6%
NO-ONE LEFT BEHIND
Beat a campaign with all 4 Survivors.
51.9%
GROUND COVER
Save another Survivor from a Special Infected while on the ground.
50.4%
DEAD STOP
Punch a Hunter as he is pouncing.
49.9%
SPINAL TAP
Kill an Infected with a single blow from behind.
49.3%
BURN THE WITCH
Light a Witch with a Molotov.
46.8%
JUMP SHOT
Headshot a Hunter while he's leaping.
44.9%
MERCY KILLER
Survive the No Mercy campaign.
44.6%
DEAD BARON
Survive the Dead Air campaign.
41.7%
TOLL COLLECTOR
Survive the Death Toll campaign.
41.5%
DOUBLE JUMP
Pounce two different Survivors on one life as a Hunter.
40.6%
CLEAN KILL
Shove a Boomer and then kill him without him splashing on anyone.
39%
DEAD WRECKENING
Dole out 5000 total Survivor damage as a Special Infected.
38.2%
GRIM REAPER
Survive the Blood Harvest campaign.
36.1%
CHAIN SMOKER
Constrict two Survivors on one life as a Smoker.
34.8%
HELPING HAND
Revive 50 incapacitated Survivors.
33.1%
DEAD GIVEAWAY
Heal a fellow Survivor when your own health is below 10.
32.9%
PHARM-ASSIST
Give pain pills to 10 Survivors.
29.8%
LAMB 2 SLAUGHTER
As an Infected, incap a Survivor who has entered and left a safe room.
29.5%
BACK 2 HELP
Leave a safe room to save an incapped teammate and bring them back safely.
29.5%
STAND TALL
Survive a campaign without being incapacitated.C
27.4%
BIG DRAG
Drag a Survivor 100 feet with your tongue as a Smoker.
26.5%
FIELD MEDIC
Heal 25 Survivors with a first aid kit.
25.1%
BARF BAGGED
Cover four Survivors with Boomer bile at once.
21.8%
All 4 Dead
Kill all four Survivors on one life as a Tank.
16.1%
DO NOT DISTURB
Sneak past all Witches in a campaign without disturbing one.
15.9%
CR0WND
Kill a Witch with a single headshot.
15.9%
AKIMBO ASSASSIN
Survive an entire campaign using only pistols.
14.8%
MAN VS TANK
Single-handedly kill a Tank.
11.5%
ZOMBICIDAL MANIAC
Survive any campaign on Expert.
11%
UNBREAKABLE
Finish a campaign without ever using a first aid kit on yourself.
9.5%
RED MIST
Kill 1000 Infected with a mounted machine gun.
6.7%
UNTOUCHABLES
No Survivors take damage after contacting the rescue vehicle.
6.1%
ZOMBIE GENOCIDEST
Kill 53,595 Infected.
4.9%
STOMACH UPSET
All Survivors complete a campaign without being vomited on.
4.8%
SAFETY FIRST
Play an entire campaign with no Survivors taking friendly fire damage.
4%
WHAT ARE YOU TRYING TO PROVE?
Survive all campaigns on Expert.
3.6%
NOTHING SPECIAL
Survive a campaign with no Survivors taking damage from Special Infected.
2.2%