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