Here is the full list of all 34 Insanity's Blade achievements.
Finish Stage 0 in Hell Mode
The taste of true defeat
Deliver a punishing ball kick!
Use a continue on Stage 0
Rip an arm off 'em!
Reach the max level!
You beat the game!
Collect all the questy things!
Bought the 6-way magic daggers!
Thurstan gets possessed
Revisit the How To Play video
Play within punching distance!
Die in the water
Get the Cock Puncher
Go corpse surfing
Set a hostage free
Now you can throw daggers!
Throw 'em around!
Tear 'em in two!
Skip the How To Play Video
You are an ARCADE MASTER!
Wow! 100% on all your saves!
Get all the pointy things!
Upgrade Finn's axes to max level!
You like to live dangerously, no saves!
Go through HELL with no saves!
Hey! We thought you liked it rough!
Beat a walking level without crouching.
Pay your dues to the zombie priests
Beat the game on Casual difficulty
Play singleplayer on the day of love
Play co-op on the day of love
Complete the Arcade adventure!
Get hugged by a crawler