Here is the full list of all 34 Insanity's Blade achievements.
Go through HELL with no saves!
You like to live dangerously, no saves!
You are an ARCADE MASTER!
Hey! We thought you liked it rough!
Finish Stage 0 in Hell Mode
Play co-op on the day of love
Upgrade Finn's axes to max level!
Complete the Arcade adventure!
Beat the game on Casual difficulty
Pay your dues to the zombie priests
Wow! 100% on all your saves!
Get all the pointy things!
Bought the 6-way magic daggers!
Revisit the How To Play video
Get the Cock Puncher
Reach the max level!
You beat the game!
Get hugged by a crawler
Collect all the questy things!
Play singleplayer on the day of love
Thurstan gets possessed
Beat a walking level without crouching.
Set a hostage free
The taste of true defeat
Die in the water
Go corpse surfing
Deliver a punishing ball kick!
Rip an arm off 'em!
Use a continue on Stage 0
Now you can throw daggers!
Tear 'em in two!
Throw 'em around!
Play within punching distance!
Skip the How To Play Video