Steven Universe: Save the Light

This achievement isn't so bad to complete, especially against the first boss of the game in the forest. Bosses will have a large red health bar that covers the top of the screen, rather than just the small one underneath them like normal enemies or stronger enemies which have a yellow health bar underneath them.

For this boss, I made good use of Pearl's javelin attack, which will travel through the normal enemies feeding logs to the boss and hit him as well, which helps keep the screen clear and less damage coming your way. If possible, have her attack upgraded enough to unlock the +50% damage when attacking from behind perk by this point. Use cakes if you're getting a lot of damage (+50 health to all characters) or just the cat cookies, and make sure your dad is always using his AOE healing song. If someone dies, you can dashboard out of the game and reload to try again, or just move on with the story and try against the next boss.

The fight against the spiky boss in Strawberry Battleground is fairly easy as well. Simply have Greg use his star power song so you can quickly place a bunch of turrets with Peridot and constantly heal whoever he tries to corner with his flail. This fight took me all of two minutes with this method.

You can also fight the final boss as many times as you want, so this is not missable.