Beat the game on any difficulty.

Make contact with the Ethereal hive mind.

In a single game, complete every Autopsy.

Kill an alien while flying. Single player only.

Gain access to the lowest level in your base.

Build a Firestorm.

Build a suit of powered armor.

Advance one of your soldiers to Colonel rank.

Acquire 1000 credits in one month.

Earn the "Excellent" rating in every performance category on a terror mission.

Fulfill a Council request.

Build a Workshop.

Stun an Outsider.