Kill 3 aliens at once

Blow up 5 enemy Gunships or Dropships

Kill 50 aliens

Drink a beer in SP

Defeat the Cycloid

Rescue the Georgian Spec Ops

Destroy the Russian weapons transfer station

Secure the VIP and transfer them to the exfiltration team

Shoot down the cargo plane

Score with a bicycle kick

Kill 10 guardians with headshots from the front while their shields are raised.

Stop a Cerberus kidnapping.