Here is the full list of all 11 Contact : Last Defence achievements.
Complete the tutorial
Score over 125,000 in arcade mode
Score over 75,000 in arcade mode
Score over 25,000 in arcade mode
Missions complete!
Upgrade plasma cannon to maximum
Upgrade missiles to maximum
You tried to push your head through a wall, well done?
Upgrade armour to maximum
You brought ultimate devistation to the enemy and scored over 250,000 in arcade mode
Missions complete on HARD mode!