While on defense, take down an attacker who's completing a Primary Objective

Take down an enemy with gunfire while knocked down

Close an enemy team's shortcut

Capture an enemy Command Post

Reveal an enemy in disguise

While on defense, prevent the attackers from completing their first objective

Disarm an HE charge

Take down an enemy by shooting a grenade

While on offense, win the match in less than 30% of the time limit

Win both story campaigns (not including What-If missions)

Win all main missions of the Resistance campaign (not including What-If missions)

Win any mission, whether campaign or What-If

Win all main missions of the Security campaign (not including What-If missions)

Win every Resistance campaign mission, including What-If missions

Complete an objective after first selecting it on the Objective Wheel

Open a shortcut for your team

Win every Security campaign mission, including What-If missions

Win all storyline campaign missions (exc. What-If missions) in either Online Versus, or in Hard mode

Complete your first 1 Star Challenge

Complete your first 3 Star Challenge

Use the last of your Supplies to refill a teammate's ammo rather than your own

Take down an enemy with a Satchel Charge

Complete all 1 Star Challenges

Reach Rank 2

Reach Rank 5

Complete all 3 Star Challenges

Collect all Audio Logs

Attempt to Revive an objective-class teammate over a non-objective teammate near a Primary Objective

Revive yourself

Take down an enemy with a mine

Upgrade your team's Command Post

As a Medic, using the Transfer Supplies ability, give the last of your Supplies away

Take down an enemy with a Cortex Bomb

Detonate a HE Charge

Spot a mine which is later defused by another Engineer

Complete an Operative Primary Objective within 5 seconds of breaking disguise