Here is the full list of all 30 Unstoppable Gorg achievements.
Check the credits
Reach wave 3 in Arcade mode
Defeat 1000 aliens.
Meet Sereia.
Complete a level using only one satellite type.
Shoot 10 asteroids
Complete any level on unstoppable difficulty.
Get all the performance medals in one level in a single try.
Complete the first level.
Get 8 upgrade tokens.
Meet the Radiant Beem.
Defeat a mothership.
Spend more than $15,000 in one level.
Deploy the Black Hole for the first time.
Complete the last level.
Reach wave 25 in Arcade mode
Reach wave 50 in Arcade mode
Achieve a total score of 10 000 000 or more
Complete all story chapters on Hard difficulty
Get hero medals from all story chapters on Hard difficulty
Complete all story chapters on Unstoppable difficulty
Get hero medals from all story chapters on Unstoppable difficulty
Complete all challenge chapters
Complete all challenge chapters on Hard difficulty
Complete all challenge chapters on Unstoppable difficulty
Achieve hero medals from 5 different story chapters
Finish a level on normal difficulty with 3 x the amount of money needed for the investor medal
Achieve hero medal in story chapter 3 on normal difficulty or harder without building a single Blast Cannon
Completed story chapter 8 on normal difficulty or harder without building a repair station
Kill 50 enemies with beam link rays