Here is the full list of all 11 Morbid Inhale Demo achievements.
Complete the first level
Complete the training levels
Complete the "Centripetal Force" level
Complete the "Round Defense" level
Use the "Ring of Fire" perk 10 times during the story campaign
Use the "Fire Bullets" perk 10 times during the story campaign
Use the "Slow Motion" perk 10 times during the story campaign
Take the 80-th level in the survival mode
Take the 140-th level in the survival modeTake the 140-th level in the survival mode
Take the 20-th level in the "Rush" mode
Survive within 5 minutes in the "Run" mode