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