Here is the full list of all 56 Copy Kitty achievements.
Beat the game as Savant on hard mode!
Beat the game as Savant!
Beat the game as Boki on hard mode!
Beat the game as Boki!
Get 300,000 points in Endless Mode!
Defeat every Yoggval on normal mode!
Create a good custom level!
Clear World 10 as Savant on hard mode!
Clear Savant's final mission!
Defeat 20 enemies using Omega Weapons!
Beat every environment in Endless Mode!
Clear World 10 as Boki on hard mode!
Defeat Arikan on hard mode!
Defeat a boss using a penguin!
In one combo, use 9 out of the 10 basic weapons! (They can each be a part of a combined shot, though.)
Get 200,000 points in Endless Mode!
Beat wave 100 in Endless Mode!
Kick Captain Yolomo off his airship and into the abyss!
Defend the skyscraper while leaving it completely intact, with Boki!
Deal the final hit to a boss in Endless Mode by jumping on it!
Clear 4 waves in Endless Mode using only the Kitty Kick!
Use every one of Boki's combined weapons at least once!
Block a Cavitation Beam using a kick!
Reflect a squeaky missile!
Destroy an enemy after you have died!
Complete Marathon Mode!
Die from something that only does 1 damage!
Defeat 25 enemies using a drill!
Get 100,000 points in Endless Mode!
Beat wave 50 in Endless Mode!
Find the Fallen Angel in Endless Mode, and defeat it!
Get 50,000 points in Endless Mode!
Combo 100 enemies in a row in Endless Mode!
Combo 50 enemies in a row in Endless Mode!
Pop all the penguins using only your feet!
Summon a dragon!
Clear Boki's final mission!
Defeat Arikan!
Defeat a ninja using a shuriken!
Defeat 10 enemies with the bunny gun!
Defeat 25 enemies using a sword!
Defeat a Krijyl!
Defeat 10 enemies using Diabolic Portal!
Squish a bug!
Defeat 3 enemies with a single one of Boki's drill kicks!
Defeat Yolomacho!
Defeat 5 enemies using a flaming whip!
Complete Savant's tutorial!
Blow up 3 enemies using one Exploder Exchikke!
Destroy 139 enemies!
Complete Boki's tutorial!