Here is the full list of all 22 Remnants of Naezith achievements.
Complete the Sand chapter
Complete the Jade chapter
Play a Custom Level
Inspect a top player
Watch a replay
Improve your time
Customize your appearance
Complete the Metal chapter
Complete the Crystal chapter
Complete all the chapters
Master the Jade chapter
Master the Sand chapter
Master the Metal chapter
Master the Crystal chapter
Master all the chapters
Speedrun the Jade chapter
Speedrun the Sand chapter
Speedrun the Metal chapter
Speedrun the Crystal chapter
Speedrun all the chapters
Find a secret
Find all the secrets