In Green Run, pacify at least 10 zombies with 1 EMP.
In TranZit, buy 2 different perks before turning on the power.
In Green Run, acquire your Tombstone.
In TranZit, defeat "him" without being attacked by "him".
In TranZit, kill one of the denizens of the forest while it is latched onto you.
Reach Sergeant (Level 10) in multiplayer Public Match.
Completed mission 1 on any difficulty.
Kill 10 Smokers as they are pulling helpless Survivors.
Reach rank 10 in Combat Training.
Give pain pills to 10 Survivors.
Survive the No Mercy campaign.
Rescue a Survivor trapped in a closet.
Set 101 Infected on fire.
Kill an Infected with a single blow from behind.
Continue playing to unlock this secret achievement.
Survive the Blood Harvest campaign.
Heal 25 Survivors with a first aid kit.
Heal a fellow Survivor when your own health is below 10.
Survive an entire campaign using only pistols.
Survive the Dead Air campaign.
Survive a campaign without being incapacitated.
Make 100 headshot kills.
Survive the Death Toll campaign.
Beat a campaign with all 4 Survivors.
Light a Tank with a Molotov.
Kill a Witch without any Survivor taking damage from her.
Light a Witch with a Molotov.
Kill a Tank without it dealing any damage to a Survivor.
Blow up 20 Infected in a single explosion.
Punch a Hunter as he is pouncing.
Free yourself from a Smoker who has grabbed you with his tongue.
Shove a Boomer and then kill him without him splashing on anyone.
You or another Survivor take no damage after being vomited on by a Boomer.
Rescue a Survivor from a Smoker's tongue before he takes damage.
See 10 different captions on your photos
See a photo get taken
Complete 20 side missions
Rescue a civilian from Reaper forces.
Investigate a sinister conspiracy.
Use clues to pinpoint the exact location of an objective.
Get an item from Michael Mamaril
Phaselock 100 enemies
Kill a flying enemy with a thrown Tediore weapon
Purchase 5 items from the black market
Redeem 25 tokens
Kill 100 enemies with the Sabre turret
Give Claptrap a high five