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