Here is the full list of all 24 Lethal VR achievements.
Perform your first double Perfect
Shoot a bullseye and a headshot into a single target
Get 10 Lethal Ratings
Score a rating on every Round
Get a rating with the OCP Gun
Get a rating for the Agent Simulation
Perform your first Perfect with any weapon
Get a rating with the Razor Tipped Hat
Get a rating for the Rookie Simulation
Score a Triple Headshot
Get a rating with Harry's Gun
Score a Triple Bullseye
Get a rating for the Recruit Simulation
Get a rating with the Throwing Star
Score a Double Headshot
Score a Double Bullseye
Get a rating for the Amateur Simulation
Get a rating with the Dundee Knife
Get a rating for the Beginner Simulation
Get a rating with the Gold Plated Gun
Score your first headshot
Score a Quick Draw rating
Score a Bullseye with a knife
Score a Fast Draw rating