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