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