Here is the full list of all 40 Demon Turf achievements.
Collect a retro arcade cartridge.
Beat all Apocadesert levels in their initial state.
Beat all Apocadesert levels in their secondary state.
Collect all the cake in Apocadesert.
Collect all the lollipops in Apocadesert.
Beat all the trophies in Apocadesert.
Beat all Armadageddon levels in their initial state.
Beat all Armadageddon levels in their secondary state.
Collect all the cake in Armadageddon.
Collect all the lollipops in Armadageddon.
Beat all the trophies in Armadageddon.
Beat all New Neo City levels in their initial state.
Beat all New Neo City levels in their secondary state.
Collect all the cake in New Neo City.
Collect all the lollipops in New Neo City.
Beat all the trophies in New Neo City.
Beat all Peak Plateau levels in their initial state.
Beat all Peak Plateau levels in their secondary state.
Collect all the cake in Peak Plateau.
Collect all the lollipops in Peak Plateau.
Beat all the trophies in Peak Plateau.
Beat the Demon King.
Buy a mod.
Buy all mods.
Buy a dye.
Buy all dyes.
Adopt a pet.
Adopt all pets.
Beat a Demon Soccer Golf course.
Beat all Demon Soccer Golf courses.
Survive in an arena match.
Survive all arena matches.
Beat a mini challenge.
Beat all mini challenges.
Collect all retro arcade cartridges.
Submit a Photo Hunt photograph.
Submit all Photo Hunt photographs.
Collect all sweets in the game.
Beat all trophies in the game.
Collect everything and unlock the final vault.