Win every Security campaign mission, including What-If missions
While on defense, take down an attacker who's completing a Primary Objective
Disarm an HE charge
Win all main missions of the Security campaign (not including What-If missions)
Attempt to Revive an objective-class teammate over a non-objective teammate near a Primary Objective
Detonate a HE Charge
Open a shortcut for your team
Take down an enemy with gunfire while knocked down
Complete all 1 Star Challenges
Capture an enemy's Command Post
Complete an objective after first selecting it on the Objective Wheel
Use the last of your Supplies to refill a teammate's ammo rather than your own
While on defense, prevent the attackers from completing their first objective
Win any mission, whether campaign or What-If
Take down an enemy with a mine
Revive yourself
Reach Rank 2
Complete your first 3 Star Challenge
Complete your first 1 Star Challenge
Win all main missions of the Resistance campaign (not including What-If missions)
Win both story campaigns (not including What-If missions)
Win every Resistance campaign mission, including What-If missions
Win all storyline campaign missions (not including What-If missions) playing either Online Versus, or in Hard mode
Close an enemy team's shortcut
Reveal an enemy in disguise
Take down an enemy by shooting a grenade
While on offense, win the match in less than 30% of the time limit.
Upgrade your team's command post
As a Medic, using the Transfer Supplies ability, give the last of your Supplies away
Spot a mine which is later defused by another Engineer
Complete an Operative Primary Objective within 5 seconds of breaking disguise
Take down an enemy with a Cortex Bomb
Take down an enemy with a Satchel Charge
Complete all 3 Star Challenges
Collect all Audio Logs
Reach Rank 5
Win Labs as both factions in Campaign Mode
Win Founders' Tower as both factions in Campaign Mode
Kill an enemy with a Napalm Grenade
Kill an enemy with a Pyro Mine
Kill an enemy with a UAV
Have a Field Regen Unit buff more than 3 players simultaneously
Reach Level 24
Pass the toilet paper to the scientist in need.
Perform surgical caffeine extraction from 20 machines.
Kill 10 Airborne Headcrabs using the Shotgun.
Kill 20 enemies with the Hivehand.
Ruin the microwave casserole.
Kill an Assassin with the .357 Magnum.
Kill 10 enemies with a reprogrammed Sentry.
Conduct all of the questionable research experiments.
Kill 10 enemies with Snarks.
Headshot 20 enemies with the .357 magnum.
Drown in Lambda Core's coolant.
Kill a Headcrab using fire.
Kill a Marine with their own grenade.
Kill 5 enemies with one grenade.
Kill an Icthyosaur with either the Tau or Gluon.
Use the alternate path in Office Complex.
Use an entire clip of Gluon ammo in one continuous shot.
Get overtaken by a Headcrab's ample anterior.
Interfere with the alarm and laptop in Anomalous Materials.
Overcharge it anyway.
Send the Hidden Hat to Xen.
Kill a Barnacle with a Satchel.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Help the Barnacle and Headcrab find true love.
Get killed by your own Snarks.
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