Here is the full list of all 23 Serious Sam 3 VR: BFE achievements.
Complete the game in single player on unmodified serious difficulty.
Complete the game in single player in the estimated time on each level.
Find Sam's classic outfit
Awake the Guardian of Time.
Start the car.
Blow a Major Biomechanoid into pieces.
Use the Mutilator to surf after a Werebull.
Smash 20 Kleers with the Sledgehammer.
Kill an enemy using the Mutilator.
Power up the Timelock.
Find at least 10 secrets in single player.
Kill 20 enemies with the Minigun without releasing the trigger.
Kill a Witch-Bride of Achriman.
Kill 5 Cave Demons while they're in air.
Solve the riddle of the Sphynx.
Defeat the spaceship.
Secure the bird.
Gib 20 enemies from close range with a shotgun.
Rescue professor Stein. So to say.
Decipher an Egyptian text.
Complete any level in single player.
Kill at least 5 headless kamikazes in one explosion.
Complete any level in cooperative with at least 2 players.