Here is the full list of all 13 Contagion VR: Outbreak Demo achievements.
Complete the Tutorial
Break all breakable melee weapons
Complete the Demo
Complete the trash minigame
Take no damage in any one game
Died 20 times
Have 1-5 HP and survive
Grab (or shoot) a hat off a zombie 3 times
Search every searchable in the demo
Kill 5 zombies with the same grenade
Complete the demo in under 8 minutes
Shoot the same zombie 35 times with the toy gun
Beat the game 10 times