Here is the full list of all 45 Ben 10 Ultimate Alien: Cosmic Destruction achievements worth 1,000 gamerscore.
Defeated all of Vulkanus’ minions
Got a 10 hit combo
Watched the entire credits
Spent 1000 on upgrades
Defeated 100 enemies
Destroyed 30 breakable objects
Found all of the hidden Sumo Slammers in the Catacombs
Completed the Catacombs level
Discovered all of the Combat Bonuses
Spent 10000 on upgrades
Got a 25 hit combo
Defeated 50 enemies as Ben Tennyson
Completed the Eiffel Tower level
Defeated 200 enemies
Found all of the hidden Sumo Slammers in the Eiffel Tower
Completed the Sunder Ultimate event
Defeated the Terracotta General
Completed the Zombozo Ultimate event
Completed the Devil's Tower level
Completed the Great Wall level
Defeated 500 enemies
Destroyed 200 breakable objects
Found all of the hidden Sumo Slammers in the Great Wall
Completed the Tokyo Nights level
Completed the Amazon level
Completed the Colosseum level
Saved all of the civilians in the Final Battle
Destroyed 500 breakable objects
Found all of the hidden Sumo Slammers in the Amazon
Found all of the hidden Sumo Slammers in the Final Battle
Destroyed all the security cameras in the Amazon level
Destroyed all cars within the game
Completed the Ultimate Echo event
Completed the Final Battle level
Completed the Game
Unlocked Rath as a playable character
Got a 100 hit combo
Found all of the hidden Sumo Slammers in the game
Found all of the hidden Sumo Slammers in the Colosseum
Found all of the hidden Sumo Slammers in Tokyo Nights
Found all of the hidden Sumo Slammers in Devils Tower
Fully upgraded all aliens
Fully upgraded one alien
Earned One Million DNA
Got a 50 hit combo