Here is the full list of all 16 Neon Prism achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Get gold medal on every level.
Collect 50 medals
Finish last level
Collect 10 medals, bronze or better.
Collect 10 silver and gold medals.
Collect 10 gold medals.
Use slow 50 times.
Use blink 50 times.
Use slow 15 times.
Use blink 15 times.
Use slow 5 times.
Use blink 5 times.
Finish first level
Use blink for the first time.
Use slow.
Finish tutorial level