UFO2: Extraterrestrials achievements

Shoot down 25 alien ships

Kill 500 aliens

Reach Colonel rank with one of your soldiers

Fly 15 planes on the globe at the same time

Eliminate UFO swarm leader

Finish game on any difficulty

Collect 4 alien crystals

Teleport 10 times during one mission

Collect 3 alien keys

Throw 100 grenades

Build 5 bases and 3 naval bases

Kill 50 aliens