Here is the full list of all 21 New Retro Arcade: Neon achievements.
Put a cassette into the boombox.
Play NewRetroArcade: Neon with a second player.
Miss the dartboard entirely with a dart.
Harras the robot.
Play a game on an arcade machine.
Play NewRetroArcade: Neon with a head mounted VR display.
Find the pink pill.
Throw a tape into a trash can.
Hit the bullseye with a dart.
Play NewRetroArcade: Neon in a full lobby of steam friends.
Put every piece of trash into a trash can.
Put the phone back in the cradle.
Enter 3D mode in 3D with the 3D glasses.
Take a selfie with the polaroid camera.
Play a total of 69 hours of NewRetroArcade: Neon.
Get 3 consecutive bullseyes in a row.
Score 1000 points darting.
Score 250 baskets.
Get 3 consecutive strikes in a row.
Finish a round of bowling with a perfect 300 score.