Here is the full list of all 24 AQUA KITTY UDX achievements.
Beat the dreadnought Ginormalous.
Beat the dreadnought Fissionchips.
Beath the dreadnought Haddokah.
Beat the dreadnought Cattrox.
Trigger 3 bombs in under 2 seconds.
Buy all items in Arcade mode in one playthrough.
Destroy 250 Craboids!
Reach wave 10 of Infinite Espresso in normal difficulty.
Destroy 50 Squadronfish!
Collect a kitten in Dreadnough mode whilst directional weapons are active.
Complete level 4 in classic mode without turning.
Save all the mining kittens in Classic mode normal difficulty.
Beat the Giant Nautilus Boss
Have all three directional pickups active at once.
Go crazy and destroy 20 enemies in under 2 seconds.
Reach a maximum chain bonus of 99.
Destroy 180 Puffabooms!
Destroy 100 Angelfishies!
Beat the Giant Angelfishy Boss
Destroy 200 Jellygrabs!
Rescue 100 Miners from being abduted.
Beat the Giant Crab Boss.
Beat the Giant Mag-Mine Boss
Destroy 80 Paleofish!