Full list of all 7 Outside the Lines achievements. It takes around 0-1 hour to unlock all of the achievements in the base game.
The base game contains 4 achievements, and there is 1 DLC pack containing 3 achievements.
Win a round as Blue Ballpoint.
Win a round as Pink Pencil.
Win a round as Green Crayon.
Come through with flying colors!
Work your magic on a piece of chalk.
Use a Paint Bucket in the last 10 seconds of a match.
Eliminate all three players with a single Water Balloon.