Basics

1: Build a small house

Rewards: 1000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Oak Planks (41)
Glass Blocks (3)
Oak Logs (12)

2: Build a small base

Rewards: 1000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Obsidian (128)
Stone Slabs (3)

3: Build a small farm

Rewards: 1500 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Oak Fences(128)
Oak Fence Gate (1)

Infrastructure

4: Build a small dock

Rewards: 1000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Oak Slabs(65)
Oak Logs (12)

5: Build a railway system

Rewards: 2000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Rails (150)
Powered Rails (50)
Redstone Blocks (50)

6: Build a street light

Rewards: 2000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Cobblestone Walls (2)
Oak Fence (1)
Torch (1)

Mobs

7: Summon an iron golem

Rewards: 300 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Iron Blocks (4)
Pumpkin (1)

8: Summon a snowman

Rewards: 150 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Snow Blocks (2)
Pumpkin (1)

Complex

9: Build a small castle

Rewards: 1000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Cobblestone (500)
Cobblestone Stairs (100)

10: Build a nether portal

Rewards: 1000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Obsidian (14)

11: Build an enchanting station

Rewards: 200 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Bookshelves (16)
Enchantment Table (1)

12: Build a skyscraper :D

Rewards: 2000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Glass Blocks (512)

13: Place the dragon egg

Rewards: 2000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Dragon Egg (1)

14: Build a basic beacon

Rewards: 2000 experience
Repeatable: True
Cooldown: 2880 Minutes
Items Needed:
Beacon (1)
Gold Blocks (9)