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