Here is the full list of all 35 Killer Clowns achievements.
Beat game on spooky difficulty.
Beat game on creepy difficulty.
Beat game on scary difficulty.
Beat game on horrifying difficulty.
Beat game on bone-chilling difficulty.
Beat game on coulrophobia difficulty.
Beat game on chronic coulrophobia difficulty.
Beat game on spooky difficulty on hardcore mode.
Beat game on creepy difficulty on hardcore mode.
Beat game on scary difficulty on hardcore mode.
Beat game on horrifying difficulty on hardcore mode.
Beat game on bone-chilling difficulty on hardcore mode.
Beat game on coulrophobia difficulty on hardcore mode.
Beat game on chronic coulrophobia difficulty on hardcore mode.
Scare away the Jugularnaut.
Finish a deathmatch.
Beat the first Jugularnaut boss without dying on chronic coulrophobia difficulty.
Beat the second Jugularnaut boss without dying on chronic coulrophobia difficulty.
Beat the third Jugularnaut boss without dying on chronic coulrophobia difficulty.
Beat the fourth Jugularnaut boss without dying on chronic coulrophobia difficulty.
Beat the fifth Jugularnaut boss without dying on chronic coulrophobia difficulty.
Run away twice from a level.
Beat the game without running away, getting the genocide bonus on each level on chronic coulrophobia difficulty.
Beat the game by running away from every level, without getting genocide bonus on chronic coulrophobia difficulty.
Beat the game on pure darkness on chronic coulrophobia difficulty.
Reach the final kill streak on chronic coulrophobia difficulty.
Beat the game with electric walls activated.
Activate level warp.
Beat survival mode on spooky difficulty.
Beat survival mode on creepy difficulty.
Beat survival mode on scary difficulty.
Beat survival mode on horrifying difficulty.
Beat survival mode on bone-chilling difficulty.
Beat survival mode on coulrophobia difficulty.
Beat survival mode on chronic coulrophobia difficulty.