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