Here is the full list of all 12 Lowglow achievements.
Complete 30 levels with less lines than the given amount. Magnificent!
Complete 15 levels with less lines than the given amount.
Open all of the vaults in Umbralight
Open your first vault.
Destroy 50 lines.
Complete the fifth chapter
Complete the fourth chapter
Complete the third chapter
Complete 5 levels with less lines than the given amount
Complete the second chapter.
Complete the first chapter.
Complete a level without missing a single drop.