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Arguably the most difficult achievement in the game, but not impossible to accomplish. To collect every Spark you MUST complete every challenge in every world at or above the top tier score and you also MUST complete all 5 chains on each overworld. There are various types of challenges, below are some tips for each of them:

Object Challenge - These challenges require you to do something with a "key item" (denoted with a crown and a neon box). You either have to move it somewhere, protect it, or otherwise interact with it in some form. For the first few worlds the game will use these challenges as tutorials for how to use certain tools and objects. In later levels you will have to use what you've learned to accomplish each task with a given inventory. Because each of these challenges are unique there is not any universal advice, instead try to familiarize yourself with the "common" objects in the game (ramps, balloons, bouncers, teleporters, etc) because you will frequently receive these in your inventory.

Pickup Party - These challenges are a harder form of the Object Challenge, though sometimes you are given free rein to your entire inventory of unlocked goods. To earn Sparks in these challenges you will have to touch them with the target object. The Sparks are usually in plain sight and on most occasions they can be reached with a well-placed spring-loaded ramp or a bouncer. If you're allowed to use teleporters don't pass on them, use them to "cheat" and easily nab out of the way Sparks.

Contraptions - These challenges require you to build either a mobile or immobile device to move, protect, or guide a given object. To make a moving device you can only connect the girder and wheels, you cannot use the blue pieces as they will pass through the girders, they do not interlock (you need to use the hinge piece to make a free-swinging attachment. To make immobile devices like bridges or shields you can use the blue blocks, but no wheels or girders (again, they do not interlock with each other you need to use a hinge). Usually you can get away with making relatively simple devices that only take a few parts and some trial and error to complete, especially on challenges where you have to carry something to a goal. If you have to make a bridge, remember to build braces for it so it can "hug" the walls and floor and stay put!

Scoretastic - By far the hardest type of challenge in the game, if not the most frustrating. Scoretastic challenges give you a key object that you must move along a gauntlet of hazards to reach a goal. You score points by touching "new objects" (objects the key object has not touched during this challenge), getting the key to do flips or air time, grabbing gems, and for interacting with certain objects (glue, bouncers, balloons, etc). For their difficulty, though, it is very easy to cheat at them. Once you unlock the Bouncer object (the orange circle that looks like a pinball bumper) you can place lots of these in your challenge to rack up a strong multiplier and earn crazy points for flips and each bounce. You can also abuse the Teleporter item (the two purple orbs connected by a tether) to effortlessly toss your key item across the level by stringing multiple teleports end to end. Generally by trapping your key item in small groups of Bouncers for short periods of time you can quickly reach the target score, then follow it up by either setting up a traditional arrangement to carry the item or just using the teleporter trick.

Chains - There are 5 Sparks on each overworld unlocked by completing "chains". These are unofficial challenges that show up at random while you are working in a given overworld or completing challenges. You may notice periodically that a column of light shows up somewhere in the overworld. This is a chain. To start it, look at the top left of your screen and you'll see an icon for a specific customization tool. Select this tool (props, texture paint, stickers, flower paint, or background stickers) and place the objects close to where the column of light is. When you place enough items the light will move. Follow it around and continue to complete its requests and eventually it will give you a Spark. It's best to do these side-missions in between challenges. Don't save them until the end because you'll end up having to sit around and wait for them to show up.

It would be outrageous to give advice for each and every challenge. Most of them are pretty self-explanatory, though if you ever find yourself stuck you can easily view actual solutions to ANY level by using the "Search" function while browsing user submissions. Simply set the search parameters to match your current overworld and challenge number to view some solutions if you ever get stuck. Many challenges have more than one solution, so find one that works for you and keep tweaking it until you get it right as sometimes you need near pixel-perfect placement in some challenges.

Additionally I have been hard at work saving solutions and tricks to unlock achievements under my own EA Create profile. If you search by Gamertag do a search for "Dracophile" and you can check out solutions to lots of tricky levels.