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