Every level has a trial but you can't complete the trial until you have completed the level at least once. Trials can be completed on a difficulty. Videos for trials on each level can be found HERE. A text guide for the trials can be found HERE.

Shadow gems are scattered around throughout each level. These are used to build your shadow magic meter. A text collectibles guide can be found HERE and a video walkthrough (including collectibles) can be found HERE.

Light gems are scattered around throughout each level. These are used to build your light magic meter. A text collectibles guide can be found HERE and a video walkthrough (including collectibles) can be found HERE.

Life gems are scattered around throughout each level. These are used to build your life meter, giving you more health. A text collectibles guide can be found HERE and a video walkthrough (including collectibles) can be found HERE.

You will get this after collecting all ninety gems. A text collectibles guide can be found HERE and a video walkthrough (including collectibles) can be found HERE.

After completing each level you will unlock it's artwork. Artwork can be purchased in the "Extras" menu. It will cost 2390 experience to buy all the artwork. If you don't want to waste that much experience on artwork, just go buy it all at once and then exit to your dashboard after the achievement unlocks.

See Epic Victory

See Epic Victory

See Epic Victory

In order to unlock Paladin difficulty for a level you will need to beat that level on any other difficulty first. All the difficulty related achievements stack. A video walkthrough for each level can be found HERE.

See Master Fight

See Master Fight

As you progress through the game, earn experience points, and start buying other combos, new combos will unlock. You will need 107,475 experience points to purchase all the combos. Gain experience by killing enemies, using combos, solving puzzles, etc. I had enough experience points to purchase all the combos after the second chapter of my second playthough. Don't waste your time farming for experience as you will gain plenty before you're done with your second playthrough.

See Veteran

See Veteran

You gain experience by killing enemies, using combos, completing levels, solving puzzles, etc. I unlocked this achievement about midway through my second playthrough. A good spot to grind experience is "Wygol Village" in Chapter 5. The ghouls grant 50 experience points and will infinite spawn until you close the holes.

Brotherhood arks are a bit more rare than magic gems. Arks will do things like give you the ability to hold more daggers or holy water. A text collectibles guide can be found HERE and a video walkthrough (including collectibles) can be found HERE.

In order to get 110% for each level you will need to find all of the Shadow gems, Light gems, Life Gems and Arks in that level. You will also need to complete that level on Paladin difficulty and complete the corresponding trial.

A trial guide can be found HERE, a text collectibles guide can be found HERE, and a video walkthrough (including collectibles) can be found HERE.