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