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.
Awake the Guardian of Time.
Start the car.
Smash 20 Kleers with the Sledgehammer.
Use the Mutilator to surf after a Werebull.
Kill an enemy using the Mutilator.
Blow a Major Biomechanoid into pieces.
Kill 20 enemies with the Minigun without releasing the trigger.
Power up the Timelock.
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.
Find Sam's classic outfit
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.
Find at least 10 secrets in single player.
Complete any level in cooperative with at least 2 players.
Kill at least 5 headless kamikazes in one explosion.