Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Bad End	Unlock the bad ending.
Boxed in!	Unknown.
Good End.	Unlock the good end.
Jumping the Gun	Unknown.
Keep off the grass	Unknown.
Massacre	Unknown.
Now you're just being silly...	Find a special way to die...
Pacifist	Unknown.
Perfect balance	Get all perfects on the tightrope challenge.
Secret friend	Find the hidden plantgirl.
Secret tunnel	Unlock the secret passage in the casino.
The Legend Of Kate	Power up the hero sword.
What? Again?!	You know what you did.
Where's the fun in that?	Unknown.
You're toying with them, aren't you?	Unknown.