Here is the full list of all 15 Spartan VR achievements.
Kill 100 minotaurs
Kill 50 medusas
Kill 25 medusas
Kill 50 minotaurs
Kill the enemies with each weapon
Find the crossbow
Kill 25 minotaurs
Kill 100 medusas
Kill 25 skeletons
Kill 50 skeletons
Kill 100 skeletons
Die 10 times
Die 25 times
Open secret gesture
Get to Hard Mode