Here is the full list of all 17 Road Defense: Outsiders achievements.
Protect the village 06
Protect the village 05
Defeat a total of 10.000 enemies.
Protect the village 04
Protect the village 03
Buy the Fusion Bomb.
Protect the village 02
Reach Level 15.
Protect the village 01
Reach Level 10.
Defeat a total of 1.000 enemies.
Protect the village 00
Reach Level 5.
Defeat a total of 100 enemies.
Buy the laser beam.
Defeat a total of 10 enemies.
Defeat a total of 20.000 enemies.