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.
Bought the 6-way magic daggers!
Set a hostage free
Play within punching distance!
Throw 'em around!
Get the Cock Puncher
Go corpse surfing
Die in the water
Now you can throw daggers!
Skip the How To Play Video
Revisit the How To Play video
You are an ARCADE MASTER!
Wow! 100% on all your saves!
Get all the pointy things!
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!
Rip an arm off 'em!
Deliver a punishing ball kick!
Pay your dues to the zombie priests
Tear 'em in two!
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
Finish Stage 0 in Hell Mode
Get hugged by a crawler
Use a continue on Stage 0