Here is the full list of all 20 Blood: Fresh Supply achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Find the secret level in Post Mortem
Defeat the 3 Beasts of Beauty and the Beast (E6M8) in under 3 minutes on Well Done difficulty or above
Find the secret level in Farewell to Arms
Complete Ghost Town (E3M1) on any difficulty without any Innocents getting killed
Find the secret level in Even Death May Die
Complete The Haunting (E2M5) in under 40 seconds on any difficulty
Find the secret level in The Way of All Flesh
Find a super secret
Exploit the Hellhound's greatest weakness
Complete Cryptic Passage on any difficulty
Find the secret level in Cryptic Passage
Complete Post Mortem on any difficulty
Complete Dead Reckoning on any difficulty
Find the secret level in Dead Reckoning
Kill yourself 10 times in single-player
Complete Farewell to Arms on any difficulty
Complete Even Death May Die on any difficulty
Complete The Way of All Flesh on any difficulty
Kill 100 Cultists
Kill a Choking Hand