Here is the full list of all 28 Corpse Killer - there are 25th Anniversary Edition achievements.
complete the gate
complete the village
complete the swamp
complete every battle scene
complete the game without normal ammo reaching zero
get 666 kills
make 666 zombies explode
rescue magliano
rescue fleming
rescue duffy
rescue cooper
defeat hellman
complete all of julie's quests
complete all of winston's quests
complete the secret quest
complete all quests
get the best outcome in the graveyard
normal difficulty
bloodthirsty difficulty
cannibal difficulty
complete the game without aborting a mission
purchase your first item
purchase all behind the scenes videos
purchase all behind the scenes photos
purchase all music tracks
purchase all documents
unlock all game videos
unlock all bonus content