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