Here is the full list of all 34 Insanity's Blade achievements.
Wow! 100% on all your saves!
Pay your dues to the zombie priests
Beat the game on Casual difficulty
The taste of true defeat
Revisit the How To Play video
Get hugged by a crawler
Use a continue on Stage 0
You beat the game!
Get all the pointy things!
Collect all the questy things!
Bought the 6-way magic daggers!
Beat a walking level without crouching.
Skip the How To Play Video
Deliver a punishing ball kick!
Set a hostage free
Reach the max level!
Now you can throw daggers!
Get the Cock Puncher
Thurstan gets possessed
Tear 'em in two!
Throw 'em around!
Rip an arm off 'em!
Go corpse surfing
Die in the water
You are an ARCADE MASTER!
Upgrade Finn's axes to max level!
Play within punching distance!
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!
Finish Stage 0 in Hell Mode