Here is the full list of all 106 The End Is Nigh achievements.
Complete Bargaining
Complete Scab or Die
Collect all Collectibles
Complete Rubble Bobble without using a continue
Complete Pus Man
Complete Depression
Complete Anger
Complete Morbid Gear without using a continue
Complete Morbid Gear with 100 rings
Complete Denial
Complete Ash Climber without using a continue
Complete Ash Climber with 100 rings
Collect 450 Tumors
Complete Fallen Fantasy without using a continue
Complete Fallen Fantasy with 100 rings
Complete Fallen Fantasy
Complete Fallen Fantasy with 50+ rings
Complete Rubble Bobble
Complete Rubble Bobble with 50+ rings
Collect Iron Cart II from the unknown
Collect Iron Cart IV from the unknown
Complete Tombs and Torture
Complete Spike Tales
Complete Ash Climber
Complete Ash Climber with 50+ rings
Collect 300 Tumors
Complete Morbid Gear
Complete Morbid Gear with 50+ rings
Complete Catastrovania without using a continue
Complete Catastrovania
Complete Catastrovania with 50+ rings
Complete Catastrovania with 100 rings
Complete The Machine
Complete Retrograde
Complete Dig Dead without using a continue
Complete Dig Dead with 100 rings
Complete Dig Dead
Complete Dig Dead with 50+ rings
Complete Golgotha
Collect Iron Cart III from the unknown
Complete Blaster Massacre without using a continue
Complete Blaster Massacre with 100 rings
Collect 170 Tumors
Complete Blaster Massacre
Complete Blaster Massacre with 50+ rings
Complete River City Rancid without using a continue
Complete River City Rancid
Complete River City Rancid with 50+ rings
Complete River City Rancid with 100 rings
Complete Morta Man with 100 rings
Complete Morta Man without using a continue
Complete Morta Man
Complete Morta Man with 50+ rings
Complete SS Exodus
Collect Iron Cart I from the unknown
Complete The Wall of Sorrow
Collect 100 Tumors
Complete The Hollows
Collect 50 Tumors
Complete Overflow
Complete The Arid Flats
Complete The End
Complete all Cartridges
100% All Cartridges
Do it all!
Complete the main game with under 200 deaths
Complete the game in an hour and a half or under
Complete Rubble Bobble with 100 rings
Complete Ghosts n Grieving
Complete Dead Racer
Beat the full game and all carts