Here is the full list of all 14 Skeet: VR Target Shooting achievements.
Get a time below 2 seconds in Quickdraw Mode
Get 8,000 or more points in Targetwall Mode
Shoot every prop in Trap Mode
Shoot two clay pigeons at once
Shoot a clay pigeon
Find the dev room
Set a high score with every gun in every mode.
Shoot all four pigs in a game of Trap Mode
Shoot down 50 UFOs
Shoot all the metal animals in Skeet Mode
Get 12,000 or more points in Trap Mode
Play a perfect game of Skeet Mode
Get 15 or more points in Bounce Mode
Get 2,000 or more points in Animal Gallery Mode