As you play and progress in Undead World: Hero Survival, you automatically complete quests for which you can collect rewards. On the main menu, a red exclamation point will appear on the Quests icon if you have one or more rewards to collect. Tap it to open the Quests menu. Along the bottom are tabs marked Daily, Weekly, and Main. The Daily and Weekly quests renew on those schedules and will reward you repeatedly for the same or similar actions. The Main quests are more linear, rewarding your overall progress in the game.
Here, the Daily Quests will reset in 6 hours and 42 minutes; that is how long you have to complete as many as possible and earn the reward chests along the top. Currently, 30 points of the potential 100 have been earned, and the first reward chest has been opened.
Each quest shows the number of points it will award upon completion, any progress currently made toward its goal, and a GO TO button to take you to the relevant game section.
The reward chests will become available as you complete the quests and collect the points for having done so. You must tap the reward chests to collect what is inside.