Here is the full list of all 18 SiegeVR achievements.
Score over 100,000 points in any game mode
Shoot 5 enemies in the knee
Get a perfect castle defense bonus
Score over 75,000 points in any game mode
Ring a bell with a flaming chicken
Shoot 5 targets within 5 seconds in Gallery
Hit 3 bullseyes in a row in a Gallery match
Achieve a 10-hit atreak during a Gallery match
Shoot a bottle out of the air
Shoot down an enemy catapult round
Hit a popup target with a thrown arrow
Give 10 high-fives
Score over 50,000 points in any game mode
Hit 5 or more enemies with one explosive arrow
Score over 25,000 points
Kill 3 enemies with head shots
Kill an enemy with a chicken
Shoot an enemy with an arrow over 50 meters away