The Accident 32 Title update for Alien Swarm: Reactive Drop has 21 achievements.
Complete Space Port Catastrophe within 1:50 on Normal difficulty or harder without any marines dying.
Complete Rapture within 2:00 on Normal difficulty or harder without any marines dying.
Complete Bunker within 1:30 on Normal difficulty or harder without any marines dying.
Complete the Accident 32 campaign on Easy difficulty or harder.
Complete the Accident 32 campaign on Normal difficulty or harder.
Complete the Accident 32 campaign on Hard difficulty or harder.
Complete the Accident 32 campaign on Insane difficulty or harder.
Complete the Accident 32 campaign on Brutal difficulty.
Complete Information Department within 1:42 on Normal difficulty or harder without any marines dying.
Complete Powerhood within 2:07 on Normal difficulty or harder without any marines dying.
Complete Research Center within 1:29 on Normal difficulty or harder without any marines dying.
Complete Confined Facility within 2:02 on Normal difficulty or harder without any marines dying.
Complete J5 Connector within 2:00 on Normal difficulty or harder without any marines dying.
Complete Lab Ruins within 3:33 on Normal difficulty or harder without any marines dying.
Complete AMBER Complex within 8:00 on Normal difficulty or harder without any marines dying.
Complete the Accident 32 campaign on Normal difficulty or harder without any marines dying.
Die in 25 different ways.
Finish Marine Academy with a score of at least 100 points.
Finish the volcano zone in Marine Academy without any marines dying.
Visit each zone (not including the lobby) in Marine Academy exactly once.
In Lab Ruins, defeat the Muon Gem boss in three hits.