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