Here is the full list of all 27 BUTCHER achievements.
Complete the game in 1 hour on at least HARD difficulty.
Complete the game in 1.5 hour on at least HARD difficulty.
Find all skulls.
Die 200 times in total.
Find 30 skulls.
Impale 50 enemies on hook by kicking them.
Impale 25 enemies on hook by kicking them.
Kill 10 enemies with a single railgun bullet.
Maul 200 enemies to death with a sawspider.
Complete the game on "Hard" difficulty.
Unlock new difficulty mode.
Find 20 skulls.
Beat The Last City.
Repeat a single level 10 times.
Beat Volcano Research Station.
Find 10 skulls.
Beat Jungle Outpost.
Kill 1000 enemies.
Make 200 enemies die horribly by burning alive.
Beat Old Military Base.
Beat Ironworks Facility.
Complete the game on "Harder" difficulty.
Complete the game on "The Hardest" difficulty.
Complete the game in 45 minutes on at least HARD difficulty.
Upload your level pack to the Workshop.