Here is the full list of all 16 Octarina achievements.
Complete First Level
Collect a tasty sushi!
Collect all the tasty sushis!
Oops!
Admit it you enjoy it!
Naughty!
You are pure Chaos!
DAMN under 50 sec, you are so fast, that's hot!
Be the fastest!
Perfect throw! Just be careful not to strain your arm, you only have seven others left.
No more poledancing for you!
Now that I would call an explosion!
Your aiming is perfect!
Find the Unicorn!
I believe I can fly!
Now I am hungry