Make contact with the Ethereal hive mind.

Shoot down a UFO.

Fulfill a Council request.

Complete a Very Difficult abduction mission in five turns or less on Classic or Impossible difficulty.

Build a Laboratory.

Acquire 1000 credits in one month.

Complete a mission without losing a soldier.

Get satellite coverage over every country on one continent.

Build the Gollop Chamber.

Stun an Outsider.

Find a soldier with the Gift.

In a single game, complete every Research Project.