Here is the full list of all 34 Insanity's Blade achievements.
Revisit the How To Play video
Bought the 6-way magic daggers!
Die in the water
Reach the max level!
You beat the game!
Collect all the questy things!
Thurstan gets possessed
The taste of true defeat
Set a hostage free
Play within punching distance!
Beat a walking level without crouching.
Get the Cock Puncher
Go corpse surfing
Now you can throw daggers!
Rip an arm off 'em!
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!
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!
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!
Finish Stage 0 in Hell Mode
Get hugged by a crawler
Use a continue on Stage 0