Die out of ammo

Clear sector #1

Kill a zombie hanging by one arm

Get 100 headshots

Grab the platform in the room with the broken bridge

Find the first Secret Room

Kill 100 zombies with the pistol

Find the first collectible item

Clear sector #2

Feed the dog. Don't fight back.

Die 10 times

Stop the reactor

Complete the jump tutorial

Clear sector #3

Kill 100 zombies with the rifle

Fall through the level

Find your way through concrete and stainless steel

Kill 100 zombies with the AR-15

Kill 100 zombies with the DEATH EAGLE

Die before reaching the first save room

Clear sector #4

Kill 50 zombies with the shotgun

Get 300 headshots

Puzzle solved 20 times

Kill 4 zombies with one gas tank

Kill Ogrin

Choose a helicopter ending

Pudge caught you. Twice.

Shock Ogrin 100 times

Find 10 Secrets Rooms

Die in slime

Jump 100 times in teleport mode

Unlocked armory 10 times

Die in the room with the destroyed bridge 3 times in a row

Kill 50 zombies with the sawed off shotgun

Choose an elevator jump ending

Heal yourself for 1000 hit points

Shock Ogrin 500 times

Stick your head in the fan

Find the Secret Room in the main menu

Gather all gun info

Use the MagicBox 20 times

Puzzle solved 50 times

Die by radiation near the reactor

Gather 20 collectible items

Kill 1000 zombies with the pistol

Shock Ogrin 1000 times

Kill 6 zombies with one gas tank

Kill 101 dogs

Gather all zombie info

Jump 1000 times in teleport mode

Killed 10 bombers with a shocker

Kill 100 zombies with the SMG

Beat the game in 1 attempt without pausing or dying

Pass the jump tutorial "in your own way"

Kill 1000 zombies with the DEATH EAGLE

Die 100 times

Kill 1000 zombies with the rifle

Kill 20 mobs with a minigun

Kill 1000 zombies with the AR-15

Killed 100 mobs with a shocker

Kill 50 bombers with a weapon before they explode

Kill 1000 zombies with the SMG

Heal yourself for 5000 hit points

Heal yourself for 10000 hit points

Puzzle solved 100 times

Kill 500 zombies with the shotgun

Kill Ogrin's crawling hand 20 times

Kill 10000 zombies with the SMG

Kill 10000 zombies with the AR-15

Kill 500 zombies with the sawed off shotgun

Kill 3000 zombies with the sawed off shotgun

Killed 500 mobs with a shocker

Killed 1000 mobs with a shocker

Use the MagicBox 100 times

Use the MagicBox 200 times

Kill 10000 zombies with the pistol

Unlocked armory 50 times

Unlocked armory 100 times

Get 3000 headshots

Kill 5000 zombies with the shotgun

Shoot the Boss' hand out of the air 50 times

Jump 10000 times in teleport mode

Kill 10000 zombies with the DEATH EAGLE

Kill 10000 zombies with the rifle

Die 1000 times

Kill 100 mobs with a minigun

Kill 500 mobs with a minigun

Killed 100 bombers with a shocker

Killed 500 bombers with a shocker

Kill 100 bombers with a weapon before they explode

Kill 500 bombers with a weapon before they explode

Kill Ogrin's crawling hand 250 times

Kill Ogrin's crawling hand 500 times

Let the monster to kill you 10 times