Complete an operation in co-op.

Beat a heist on normal difficulty or above, having killed a Bulldozer without taking damage from any Bulldozer. To complete this challenge, you will have to have played the heist from the start.

Point out a special enemy using the "shout out" command.

Mind Control an Ethereal. Single player only.

Staff the Research Labs with 80 scientists.

Acquire 1000 credits in one month.

Kill 500 aliens.

Get satellite coverage over every country on one continent.

In a single game, shoot down one of each alien craft.

Build the Gollop Chamber.

Successfully assault an Overseer UFO.

Build a Firestorm.

Build the Hyperwave Relay.