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