Kill one of your own soldiers during a tactical combat mission.

Kill an alien using an energy weapon.

Win the campaign on Veteran difficulty or higher.

Shoot down a UFO with an interceptor.

Shoot down a Battleship UFO with an interceptor.

Have a soldier achieve the rank of Colonel.

Lose a soldier in a tactical combat mission.

Win the campaign on Recruit difficulty or higher.

Have an interceptor shoot down 20 UFOs.

Kill an alien with reaction fire during a tactical combat mission.

Set foot upon the alien homeworld.

Deploy a squad consisting entirely of Colonels on a tactical mission.

Kill an alien in a tactical combat mission.

Construct an additional base on the Geoscape.

Capture the Cleaner facility

Have a soldier with 20 alien kills.

Stun an alien with a Stun Baton.

Win the campaign on Commander difficulty.

Equip a soldier with a Colossus Battlesuit..

Win the campaign on Soldier difficulty or higher.