Here is the full list of all 17 Aliens Attack VR achievements.
Finish a game with an accuracy score of 80% or more
Finish a game with all pillars at full health
KIll 1000 enemies
KIll 500 enemies
KIll 100 enemies
Play 20 games
Headbutt an enemy 50 times
Achieve a score of at least 2500 points
Achieve a score of at least 3000 points
Achieve a score of at least 4000 points
Hit an enemy with a weapon 10 times
Hit an enemy with a weapon 30 times
Hit an enemy with a weapon 300 times
Pick up and use a power-up
Kill your first blob
Kill 25 blobs
Kill 50 enemies hitting them with another enemy