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