Here is the full list of all 21 Scrap Attack VR achievements.
Finish One Game
Finish 10 Games
Finish Wave 15 on Easy
Finish Wave 15 on Medium
Finish Wave 15 on Hard
Finish Wave 20 on any Difficulty
Shoot 5 Enemy Projectiles
Shoot 50 Enemy Projectiles
Scrap 100 Enemies
Scrap 1000 Enemies
Scrap 10 Enemies with Critical Hits
Scrap 100 Enemies with Critical Hits
Teleport 100 Times
Score 100,000 Points in One Game
Scrap Big Red
Scrap an Enemy from a Large Distance
Hit 5 Enemies at the same Time
Pop a Jellofish
Shoot a Target
Shoot a Gnome
Complete the tutorial