Here is the full list of all 12 Shutshimi achievements.
Complete Boss Rush mode. Talk about deja vu!
Defeat the final terror of the sea. No bigger fish to fry!
Amass a total of 53594 kills...give or take 52594.
Clear a bouncy castle round by bouncing off the floor fewer than 6 times. You should play Bassketball!
Wear 3 hats in a single game. That's called a Hat Trick!
Survive 10 waves with a score of 0. Nothing like a game of Invasion Golf!
Acquire over 9000 points in a single game. But try not to break anything.
Acquire the hero's cape. Finally, some clothing!
Clear 10 shop rounts within 2 seconds each in a single game. Don't look, just pick!
What a horrible night to have a sweet pair of sunglasses.
With the lipstick equipped, smooch a shark. I'm just after the achievement - it's not like I like you or anything!
Clear 10 consecutive waves wearing the Foam Dome. Now you're drinkin' like a fish!