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