Your actions will earn you achievements as you quest along, and if you know what those achievements are prior to your adventuring, you can tailor your actions to fulfill some of them.
As you might expect, you gain achievements for straightforward actions, such as completing chapters or finding all of a certain collectible; however, you also achieve status for killing 20 enemies with explosive barrels, creating your own Crucible maps, and amassing 100,000 gold! For complete details on all the game’s achievements, flip to the “Achievements and Secrets” chapter later in the guide.
When you finally complete the campaign, you unlock a special "Adventure +" mode, which gives you upgraded armaments, fun tweaks to the game, and the Old School difficulty setting. Old School modifies the game so that you are forced to do all of the secret and puzzles areas. You begin with 25 percent of the Crystals you had from your previous playthrough and a special weapon that is better than the first-tier weapons you would normally start with in Chapter 1. Check it out on subsequent playthroughs for a little spice.