Here is the full list of all 34 Insanity's Blade achievements.
Reach the max level!
You beat the game!
Collect all the questy things!
Thurstan gets possessed
Beat a walking level without crouching.
Die in the water
Go corpse surfing
Now you can throw daggers!
Tear 'em in two!
Throw 'em around!
Skip the How To Play Video
You are an ARCADE MASTER!
Wow! 100% on all your saves!
Get all the pointy 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!
Rip an arm off 'em!
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!
Set a hostage free
The taste of true defeat
Revisit the How To Play video
Finish Stage 0 in Hell Mode
Get hugged by a crawler
Get the Cock Puncher
Use a continue on Stage 0