Here is the full list of all 23 Walhall achievements.
As if it wasn't hard enough
Deceiving death itself
It gets spiky
Like a blue hedgehog!
Button 2 is more useful now
One after the other!
Gotta shoot fast
Babies make you tougher
You're gonna love 'em
Copying enemy movements
A new challenger appears!
He lost his drill for...
Helps hitting your target
You're feeling tough
At last you can watch it
Speed up!
Your actions are under control
Take me seriously!
I'm gonna catch you!
He also wants to hit
REAL blue hedgehog!
Thank you for playing!
You're the real champion!