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