Here is the full list of all 14 Galaxy Annihilation achievements.
Shoot 5.000 bullets in campaign mode.
Shoot 15.000 bullets in campaign mode.
Shoot 25.000 bullets in campaign mode.
Destroy 1.000 enemies in campaign mode.
Destroy 2.000 enemies in campaign mode.
Destroy 5.000 enemies in campaign mode.
Reach 5.000 score in survival mode.
Reach 10.000 score in survival mode.
Reach 15.000 score in survival mode.
Reach 25.000 score in survival mode.
Buy all the ships available in the shop.
Buy all the weapons available in the shop.
Destroy all the bosses in campaign mode.
Complete all the achievements.