Here is the full list of all 55 Serious Sam VR: The Last Hope achievements.
Complete a level 10 arena
Complete a level 5 arena
Activate time stop
Fire an orbital laser storm
All 5 wood medals
All 5 bronze medals
All 5 silver medals
All 5 gold medals
Defeat the Earth giant
Deploy a dummy decoy
Detonate a serious bomb
Defeat the giant Swamp Hive
Unleash an army of domestic spiders
Deploy a defense turret
First gold medal
Use the portable medkit
Activate serious damage
Step into the arena
Fire the orbital stun field
Deploy a drone squad
Defeat the Shaanti dragon
Defeat the giant anomaly
First silver medal
First perfect normal
Complete a co-op game
Fire an orbital laser strike
Unlocked a skill
First wood medal
First bronze medal
First perfect tourist
First perfect easy
Defeat the giant mummy
Step into the battlecruiser Saratoga
First platinum medal
First perfect hard
First perfect serious
All 5 platinum medals
All perfect tourist
All perfect easy
All perfect normal
All perfect hard
All perfect serious
Unlocked the entire skill tree
Complete a planet without healing
Complete a mission on hard without taking any damage
Complete a level 15 arena
Complete a level 20 arena
Complete all level 5 arenas
Complete all level 10 arenas
Complete all level 15 arenas
Complete all level 20 arenas
Fire the orbital psi laser
Activate invulnerability
Activate money time
Activate rage