Complete Deluge
Staff the Research Labs with 80 scientists.
Deal with the newest global threat
Make certain of the new threat's location
Eliminate all alien waves
Get at least 4 kills with XCOM Base Security personnel
Kill a Muton Berserker in melee combat in single player
Deploy three tactical subsystems on a single soldier in single player
Augment a soldier in single player
Gain access to the lowest level in your base.
Staff the Engineering Department with 80 engineers.
Build a suit of powered armor.
Proc Combat Rush on the entire squad (min. 4)
Kill an elite enemy Medic with explosive damage in single player
Kill an elite enemy Sniper with one of your own snipers in single player
Get satellite coverage over every country on one continent.
Fulfill a Council request.
Beat a new special mission without losing any assets
Modify a soldier in single player
Acquire 1000 credits in one month.
Advance one of your soldiers to Colonel rank.
Eradicate the infestation
Build a Workshop.
Build a Laboratory.
Stop a squad member from suffocating in single player
Launch a Satellite.
Build an item.
Shoot down a UFO.
Complete a Research Project.
Build a base facility.
Complete a mission without losing a soldier.
Kill 50 aliens with explosive weapons.
Kill 150 aliens.
Kill 500 aliens.
You made a kill look like an accident
You subdued a person
You located the hotel room number 899
You successfully performed a lethal throw
You unlocked a technique
You achieved Silent Assassin
You remained undetected throughout a checkpoint