Here is the full list of all 34 Insanity's Blade achievements.
You beat the game!
Get hugged by a crawler
Collect all the questy things!
Bought the 6-way magic daggers!
Thurstan gets possessed
Upgrade Finn's axes to max level!
Set a hostage free
Go corpse surfing
Die in the water
Rip an arm off 'em!
Now you can throw daggers!
Tear 'em in two!
Throw 'em around!
Play within punching distance!
Skip the How To Play Video
You are an ARCADE MASTER!
Wow! 100% on all your saves!
Get all the pointy things!
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.
Deliver a punishing ball kick!
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!
The taste of true defeat
Revisit the How To Play video
Reach the max level!
Finish Stage 0 in Hell Mode
Get the Cock Puncher
Use a continue on Stage 0