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

Capture an enemy's Command Post

Win any mission, whether campaign or What-If

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

Reach Rank 2

Infiltrate the CELL facility at Wall Street

Single Player: Kill 5 enemies while sliding

Single Player: Kill two enemies with a single bullet

Single Player: Kill at least 3 enemies with a single grenade

Assimilate alien tissue at the crash site

Escape the Battery Park evacuation center

Collect 20 Dogtags

Create your first custom class