Slap more than one player at once

Accumulate 20 deaths in one Story level

Score a 5x multiplier in a Story level

Place in the top 50% of players in the online scoreboard for a Story level

Change your costume

Revive a Co-op player 20 times

Detonate fallen Leeches to kill 25 enemies

Don't allow any counter-attackers into the Washington Square base

Get to the first mineshaft without being hit by sniper fire in Mt. Pleasant, PA

Collect all Deadeye rifles without dying while fighting the Widowmaker in St. Louis

Use the upgraded Deadeye secondary fire to kill 2+ enemies, 5 times

Kill 40 Bullseye tagged enemies